Copy of `Dorland's Medical Dictionary`

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Dorland's Medical Dictionary Category: Health and Medicine > Medical Dictionary Date & country: 31/12/2010, USA Words: 39128

hernial aneurysm
one whose sac is formed by an inner coat projecting through the outer.

hernial sac
the peritoneal pouch that encloses protruding intestine.

herniated disk
(her´ne-āt″ed) a condition of the vertebral column in which all or part of a nucleus pulposus protrudes through the weakened or torn outer ring (anulus fibrosus) of an intervertebral disk. This happens most often in the lower back, and occasionally in the neck or upper thoracic region. The herniated nucleus pulposu...

herniation
(hur″ne-a´shәn) abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering membrane, muscle, or bone. See also hernia.

herniation of intervertebral disk
herniated disk.

hernioid
(hur´ne-oid) resembling hernia.

hernioplasty
(hur´ne-o-plas″te) surgical repair of a hernia; sometimes used specifically to refer to use of a mesh patch or plug to reinforce the area of the defect. See also herniorrhaphy.

herniorrhaphy
(hur″ne-or´ә-fe) surgical repair of hernia, sometimes used specifically to refer to simple apposition and suturing of the defect. See also hernioplasty.

heroin
(her´o-in) a highly addictive narcotic derived from morphine. Because of its vulnerability to abuse, its medicinal use and sale are prohibited in the United States and many other countries. (See drug abuse.) Called also diacetylmorphine.

herpangina
(hur″pәn-ji´nә) an infectious disease caused by either group A or B coxsackievirus or by echoviruses, chiefly affecting young children in the summer, and characterized by vesiculoulcerative lesions on the mucous membranes of the mouth and throat, dysphagia, fever, vomiting, and prostration.

herpangina virus
any of several virus types of the coxsackievirus A group, causing a febrile disease, usually of children, characterized by small herpes-like lesions on the soft palate or in the faucial area.

herpes
(hur´pēz) any inflammatory skin disease caused by a herpesvirus and characterized by formation of small vesicles in clusters. When used alone the term may refer to either herpes simplex or herpes zoster.

herpes angina
herpangina.

herpes corneae
(hur´pēz kor´ne-e) herpetic keratitis.

herpes encephalitis
that caused by a herpesvirus, resembling equine encephalomyelitis.

herpes febrilis
(hur´pēz fә-bri´lis) a variety of herpes simplex usually found on or around the lips and nostrils but occasionally on other mucoid tissues. It is generally caused by human herpesvirus 1, although occasionally it may be caused by human herpesvirus 2. It is usually seen with a fever, but may also develop in situation...

herpes genitalis
(hur´pēz jen″ĭ-ta´lis) genital herpes.

herpes gladiatorum
(hur´pēz glad″e-ә-tor´әm) a self-limiting type of herpes simplex infection of the skin after trauma. The virus enters through burns or other wounds, the temperature rises moderately, and vesicles appear around the wound. Called also traumatic or wrestler's herpes.

herpes labialis
(hur´pēz la″be-a´lis) herpes febrilis on the vermilion border of the lips.

herpes progenitalis
(hur´pēz pro-jen″ĭ-ta´lis) herpes genitalis.

herpes simplex
(hur´pēz sim´pleks) any of a group of acute viral infections caused by human herpesviruses 1 and 2, characterized by small fluid-filled vesicles on the skin or mucous membranes. The infection may be a primary one or a reactivation of a latent infection. Type 1 herpesvirus infections usually involve nongenital regio...

herpes simplex virus
former name for any virus that causes herpes simplex, now called human herpesviruses; see herpesvirus.

herpes simplex virus pneumonia
a type of viral pneumonia seen in neonates or immunocompromised patients, caused by spread of a herpes simplex virus infection into the lungs; characteristics include dyspnea, cough, and hypoxemia in conjunction with other manifestations of the herpesvirus infection.

herpes zoster
(hur´pēz zos´tәr) an acute viral disease caused by a herpesvirus (the same virus that causes chickenpox); characteristics include inflammation of spinal ganglia with pain and a vesicular eruption along the area of distribution of a sensory nerve. It may appear in persons who have been exposed to chickenpox; i...

herpes zoster oticus
(hur´pēz zos´tәr o´tĭ-kәs) Ramsay Hunt syndrome.

Herpesviridae
(hur″pēz-vi´rĭ-de) the herpesviruses, a large family of DNA viruses; the strains affecting humans are called human herpesviruses and cause herpes simplex, herpes zoster, chickenpox, infectious mononucleosis, and cytomegalic inclusion disease. There are three subfamilies, Alphaherpesvirinae, Betaherpesvirinae, ...

herpesvirus
(hur´pēz-vi″rәs) herpes virus any virus of the family Herpesviridae.

herpetic
(hәr-pet´ik) pertaining to or of the nature of herpes. relating to or caused by herpesviruses.

herpetic keratitis
a type caused by infection with herpes simplex virus, often with dendritic ulceration (dendritic keratitis. keratitis occurring as a complication of herpes zoster ophthalmicus.

herpetic stomatitis
herpes simplex involving the oral mucosa and lips, characterized by the formation of yellowish vesicles that rupture and produce ragged painful ulcers covered by a gray membrane and surrounded by an erythematous halo.

herpetiform
(hәr-pet´ĭ-form) resembling herpes.

Herring bodies
hyaline or colloid masses scattered throughout the pars nervosa of the pituitary gland.

Herrmann syndrome
(hur´mәn) an autosomal dominant syndrome characterized initially by photomyogenic seizures and progressive deafness, with later development of diabetes mellitus, nephropathy, and mental deterioration progressing to dementia.

Hers disease
(ārz) glycogen storage disease, type VI.

hersage
(ār-sahzh´) surgical separation of the fibers of a peripheral nerve.

Herter disease
(hur´tәr) Herter-Heubner disease (hur´tәr hoib´nәr) the infantile form of celiac disease.

hertz
(Hz) (herts) the SI unit of frequency, equal to one cycle per second.

HERV
human endogenous retroviruses.

Hess capillary test
tourniquet test (def. 1).

Hesselbach hernia
hernia of intestine through the cribriform fascia.

Hesselbach triangle
(hes´әl-bahk) inguinal triangle (def. 1).

hetacillin
(het″ә-sil´in) a semisynthetic penicillin that is converted in the body to ampicillin and has actions and uses similar to those of ampicillin.

hetastarch
(het´ә-stahrch) an artificial colloid produced by addition of hydroxyethyl ether groups into amylopectin; used as an artificial plasma extender for treatment of shock.

heteradelphus
(het″әr-ә-del´fәs) conjoined twins with one fetus markedly more developed than the other.

heterecious
(het″әr-e´shәs) requiring different hosts in different stages of development; a characteristic of certain parasites.

heterergic
(het″әr-ur´jik) having different effects; said of two drugs, of which one produces a particular effect and the other does not.

heteresthesia
(het″әr-es-the´zhә) variation of cutaneous sensibility on adjoining areas.

hetero-osteoplasty
(het″әr-o-os´te-o-plas″te) osteoplasty with bone taken from an individual of another species.

heteroagglutination
(het″әr-o-ә-gloo″tĭ-na´shәn) agglutination of particulate antigens of one species by agglutinins derived from another species.

heteroagglutinin
(het″әr-o-ә-gloo´tĭ-nin) an agglutinin that is capable of heteroagglutination.

heteroantibody
(het″әr-o-an″tĭ-bod´e) an antibody combining with antigens originating from a species foreign to the antibody producer.

heteroantigen
(het″әr-o-an´tĭ-jәn) an antigen originating from a species foreign to the antibody producer.

heteroblastic
(het″әr-o-blas´tik) originating in a different kind of tissue.

heterocellular
(het″әr-o-sel´u-lәr) composed of cells of different kinds.

heterocephalus
(het″әr-o-sef´ә-lәs) a malformed fetus with two heads of unequal size.

heterochromatin
(het″әr-o-kro´mә-tin) the form of chromatin that is dark-staining, genetically inactive, and tightly coiled. See also euchromatin. constitutive heterochromatin the chromatin in regions of the chromosomes that are invariably heterochromatic; it contains highly repetitive ...

heterochromia
(het″әr-o-kro´me-ә) diversity of color in a part normally of one color. heterochromia iridis difference in color of the iris in the two eyes, or in different areas in the same iris.

heterochromic cataract
a secondary, posterior cortical cataract symptomatic of heterochromic cyclitis; failing vision is often the first symptom.

heterochronia
(het″әr-o-kro´ne-ә) irregularity in time; occurrence at abnormal times.

heterochronic
(het″әr-o-kron´ik) pertaining to or characterized by heterochronia. denoting different ages or stages of development, as between an excised organ and an implanted one in transplantation operations. a difference in the rate or time of occurrence between two processes.

heterocladic anastomosis
one between branches of different arteries.

heterocyclic
(het″әr-o-sik´lik) (-si´klik) having or pertaining to a closed chain or ring formation that includes atoms of different elements.

heterocytotropic
(het″әr-o-si″to-tro´pik) having an affinity for cells from different species.

heterodermic
(het″әr-o-dur´mik) denoting skin for grafting taken from an animal of another species; see heterodermic graft.

heterodermic graft
a skin graft taken from a donor of another species.

heterodont
(het´әr-o-dont) having teeth of different shapes, such as the molars and incisors of humans.

heterodromous
(het″әr-od´ro-mәs) moving or acting in other than the usual or forward direction.

heteroeroticism
(het″әr-o-ә-rot´ĭ-siz-әm) sexual feeling directed toward another person, sometimes specifically one of the opposite sex. alloeroticism (def. 1). a stage in which the erotic energy is directed toward objects other than oneself, specifically to those of the opposite sex. ...

heterogamety
(het″әr-o-gam´ә-te) production of unlike gametes; said especially of the human male, who produces two types of sperm, one containing the X chromosome and the other containing the Y chromosome. adj., heterogamet´ic, adj. .

heterogamy
(het″әr-og´ә-me) the conjugation of gametes differing in size and structure to form the zygote from which the new organism develops; this occurs in higher life forms.

heterogeneic antigen
xenogeneic antigen.

heterogeneity
(het″әr-o-jә-ne´ĭ-te) the state or quality of being heterogeneous. genetic heterogeneity the production of identical or similar phenotypes by more than one genetic mutation; either by different mutant alleles at the same locus (allelic heterogeneity) or by ...

heterogeneous
(het″әr-o-je´ne-әs) consisting of or composed of dissimilar elements or ingredients; not having a uniform quality throughout. in genetics, pertaining to a phenotype that can be produced by different mutations.

heterogeneous nuclear RNA
(hnRNA) a diverse group of long RNA molecules formed in the eukaryotic nucleus, many of which will be processed to form messenger RNA molecules.

heterogeneous system
a system or structure made up of mechanically separable parts, as an emulsion.

heterogenetic antigen
heterophil antigenheterophile antigen one capable of stimulating the production of antibodies that react with tissues from other animals or even plants.

heterogenote
(het´әr-o-je″nōt) a cell that has an additional genetic fragment, different from its intact genotype; usually resulting from transduction.

heterogenous
(het″әr-oj´ә-nәs) xenogeneic. heterogeneous.

heterograft
(het´әr-o-graft″) xenograft.

heterohemagglutination
(het″әr-o-he″mә-gloo″tĭ-na´shәn) agglutination of erythrocytes by a hemagglutinin derived from an individual of a different species.

heterohemagglutinin
(het″әr-o-he″mә-gloo´tĭ-nin) a hemagglutinin that agglutinates erythrocytes of organisms of other species.

heterohemolysin
(het″әr-o-he-mol´ә-sin) a hemolysin that destroys erythrocytes of animals of species other than that of the animal in which it is formed.

heterokeratoplasty
(het″әr-o-ker´ә-to-plas″te) grafting of corneal tissue taken from an individual of another species.

heterolalia
(het″әr-o-la´le-ә) the saying of words other than the ones meant; called also heterophasia.

heterolateral
(het″әr-o-lat´әr-әl) contralateral.

heterologous
(het″әr-ol´ә-gәs) made up of tissue not normal to the part. xenogeneic. possessing different alleles in regard to a given characteristic.

heterologous graft
heteroplastic graft xenograft.

heterologous tumor
heterotypic tumor one made up of tissue differing from that in which it grows.

heterologous vaccine
a vaccine that confers protective immunity against a pathogen that shares cross-reacting antigens with the microorganisms in the vaccine.

heterolysin
(het″әr-ol´ĭ-sin) an antibody that lyzes cells of species other than the one in which it is formed.

heterolysis
(het″әr-ol´ĭ-sis) destruction of cells of one species by lysin from another species. adj., heterolyt´ic., adj.

heteromeral cells
heteromeric cells nerve cells of the gray matter of the spinal cord whose axon processes pass to the white matter of the opposite side; called also commissural cells.

heteromeric
(het″әr-o-mer´ik) sending processes through one of the commissures to the white matter of the opposite side of the spinal cord.

heterometaplasia
(het″әr-o-met″ә-pla´shә) formation of tissue foreign to the part where it is formed.

heterometropia
(het″әr-o-mә-tro´pe-ә) the state in which the refraction in the two eyes differs.

heteromorphic
(het″әr-o-mor´fik) of abnormal shape or structure. morphologically dissimilar.

heteromorphosis
(het″әr-o-mor-fo´sis) the development, particularly through regeneration, of an organ or structure inappropriate to the location.

heteronomous
(het″әr-on´ә-mәs) subject to different laws; in biology, subject to different laws of growth or specialized along different lines.

heteropagus
(het″әr-op´ә-gәs) conjoined twins consisting of unequally developed components.

heteropathy
(het″әr-op´ә-the) abnormal or morbid sensibility to stimuli.