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

syringobulbia
(sĭ-ring´go-bul´be-ә) syringomyelia in which the cavity extends to involve the medulla oblongata.

syringocele
(sĭ-ring´go-sēl) a cavity-containing herniation of the spinal cord through the bony defect in spina bifida.

syringocoele
(sĭ-ring´go-sēl) the central canal of the spinal cord.

syringocystadenoma
(sә-ring″go-sis-tad″ә-no´mә) a benign adnexal tumor of the sweat glands; called also hidradenoma.

syringoma
(sir″ing-go´mә) a benign tumor believed to originate from the ductal portion of the eccrine sweat glands, occurring as multiple small flesh-colored papules on the face, neck, upper chest, and sometimes the vulva, usually in postpubertal women, characterized by dilated cystic sweat ducts in a fibrous stroma. ...

syringomatous carcinoma
microcystic adnexal carcinoma.

syringomeningocele
(sĭ-ring″go-mĕ-ning´go-sēl) meningocele resembling syringomyelocele.

syringomyelia
(sĭ-ring″go-mi-e´le-ә) a slowly progressive syndrome in which cavitation occurs in segments of the spinal cord, usually in the cervical region. The lesions may extend up into the medulla oblongata (syringobulbia) or down into the thoracic region. The condition may be congenital or arise secondary to tum...

syringomyelic syndrome
syringomyelia.

syrinx
(sir´inks) a tube or pipe; a fistula.

syrup
(sir´әp) a thick, concentrated solution of a sugar, such as sucrose, in water or a similar liquid; combined with other ingredients, such a solution is used as a flavored vehicle for medications. The term is sometimes used for something suspended in such a substance, such as a cough syrup.

systaltic
(sis-tawl´tik) alternately contracting and dilating; pulsating.

system
(sis´tәm) a set or series of interconnected or interdependent parts or entities (objects, organs, or organisms) that act together in a common purpose or produce results impossible by action of one alone. an organized set of principles or ideas. adj., systemat´ic, system´ic., adj.

systematic name
in chemical nomenclature, a name of a substance based on the chemical structure of a compound.

systematized delusions
a group of delusions organized around a common theme; typical of delusional disorders or paranoid schizophrenia.

systemic
(sis-tem´ik) pertaining to or affecting the body as a whole.

systemic circulation
the flow of blood from the left ventricle through the aorta, carrying oxygen and nutrient material to all the tissues of the body, and returning through the superior and inferior venae cavae to the right atrium.

systemic disease
one affecting a number of tissues that perform a common function.

systemic lupus erythematosus
(SLE) a chronic inflammatory disease, usually febrile, with damage to the skin, joints, kidneys, nervous system, mucous membranes, and less often other organs; it usually has periods of remissions and exacerbations. It is primarily a disease of women, occurring five to ten times more often in females than in...

systemic scleroderma
a systemic disorder of the connective tissue characterized by hardening and thickening of the skin, with telangiectasias, Raynaud phenomenon, and fibrotic degenerative changes in organs such as the heart, lungs, kidneys, and gastrointestinal tract. It may remain confined to the face and hands for a long time or may spread diffu...

systemic sclerosis
systemic scleroderma.

systemic venous hypertension
elevation of systemic venous pressure, usually detected by inspection of the jugular veins.

systole
(sis´to-le) the contraction, or period of contraction, of the heart, especially of the ventricles, during which blood is forced into the aorta and pulmonary artery. adj., systol´ic., adj. atrial systole contraction of the atria by which blood is forced into the ventricles; ...

systolic blood pressure
arterial blood pressure during systole.

systolic current of injury
the current that flows from healthy tissue to injured tissue during electrical systole.

systolic murmur
a heart murmur heard at systole, usually due to mitral or tricuspid regurgitation or to aortic or pulmonary obstruction.

systolic pressure
systolic blood pressure.

systremma
(sis-trem´ә) a cramp in the muscles of the lower leg.

TA
toxin-antitoxin. Terminologia Anatomica; toxin-antitoxin.

Ta
tantalum.

Ta wave
a small asymmetric wave, of opposite polarity to the P wave, representing atrial repolarization; together with the P wave it defines atrial electrical systole. In most electrocardiograms, it is obscured by the QRS complex.

TAA
tumor-associated antigen.

TAB
a vaccine prepared from killed typhoid, paratyphoid A and paratyphoid B bacilli.

tabacosis
(tab″ә-ko´sis) poisoning by tobacco, chiefly by inhalation of tobacco dust (a form of pneumoconiosis).

tabanid
(tab´ә-nid) a biting insect of the family Tabanidae, including the horseflies and deerflies.

Tabanus
(tә-ba´nәs) a genus of biting, bloodsucking horseflies that transmit trypanosomes and anthrax to various animals.

tabes
(ta´bēz) wasting of the body or a part of it. tabes dorsalis. adj., tabet´ic., adj. tabes dorsalis a slowly progressive neurological disorder resulting from degeneration of the posterior columns of the spinal cord along with sensory nerve trunks, so that there ...

tabescent
(tә-bes´әnt) wasting away; see wasting.

tabetic crisis
a painful paroxysm occurring in tabes dorsalis.

tabetic gait
an ataxic gait that accompanies the neurologic damage of tabes dorsalis; the feet slap the ground, and in daylight these patients must watch their feet to avoid unsteadiness.

tabetiform
(tә-bet´ĭ-form) resembling tabes.

tablature
(tab´lә-chәr) separation of the chief cranial bones into inner and outer tables, separated by a diploë.

table
(ta´bәl) a flat layer or surface.

tablet
(tab´lәt) a solid dosage form containing a medicinal substance with or without a suitable diluent. Called also pill. buccal tablet one which dissolves when it is held between the cheek and gum, permitting direct absorption of the active ingredient through the oral mucosa. ...

taboo
(tă-boo´) any of the negative traditions, objects, or behaviors generally regarded as harmful to social welfare and therefore prohibited. excluded from use; prohibited.

tabular
(tab´u-lәr) resembling a table.

TAC solution
a solution of tetracaine, epinephrine, and cocaine, used as a local anesthetic in the emergency treatment of uncomplicated lacerations.

Tacaribe complex
a group of antigenically related viruses comprising the New World arenaviruses, which cause hemorrhagic fever in South America.

tache
(tahsh) French word meaning spot. tache cérébrale (“cerebral spot”), a congested streak produced by drawing the nail across the skin; a concomitant of various nervous or cerebral diseases. tache noire (“black spot”), an ulce...

tachogram
(tak´o-gram) the graphic record produced by tachography.

tachography
(tә-kog´rә-fe) the recording of the movement and speed of the blood current.

tachyarrhythmia
(tak″e-ә-rith´me-ә) tachycardia associated with arrhythmia. It may be either supraventricular, such as atrial tachycardia, atrial flutter, or atrial fibrillation, or ventricular, such as ventricular tachycardia or ventricular fibrillation.

tachycardia
(tak″ĭ-kahr´de-ә) abnormally rapid heart rate, usually taken to be over 100 beats per minute. adj., tachycar´diac., adj.

tachydysrhythmia
(tak″e-dis-rith´me-ә) an abnormal heart rhythm with rate greater than 100 beats per minute in an adult; the term tachyarrhythmia is usually used instead.

tachylalia
(tak″e-la´le-ә) logorrhea.

tachymeter
(tә-kim´ә-tәr) an instrument for measuring rapidity of motion.

tachyphagia
(tak″ĭ-fa´je-ә) rapid eating.

tachyphasia
(tak″e-fa´zhә) logorrhea.

tachypnea
(tak″ip-ne´ә; tak″e-ne´ә) very rapid respirations, seen especially in high fever when the body attempts to rid itself of excess heat. The rate of respiration increases at a ratio of about eight breaths per minute for every degree Celsius above normal. Other causes include pneumonia, compens...

tachyrhythmia
(tak″ĭ-rith´me-ә) tachycardia.

tachysterol
(tak-is´tә-rol) an isomer of ergosterol, an antirachitic substance, produced by irradiation of ergosterol.

tacrine
(tak´rēn) a cholinesterase inhibitor used to improve cognitive performance in treatment of dementia of the Alzheimer type; used as the hydrochloride salt.

tacrolimus
(tak″ro-li´mәs) an immunosuppressant derived from a species of Streptomyces, having actions similar to those of cyclosporine; administered orally or intravenously to prevent rejection of organ transplants and topically to treat moderate to severe atopic dermatitis.

tactile
(tak´til) pertaining to touch.

tactile agnosia
inability to recognize familiar objects by touch. See also astereognosis.

tactile anesthesia
loss of the sense of touch.

tactile cell
tactile receptor.

tactile hairs
hairs sensitive to touch.

tactile hallucination
a hallucination of touch.

tactile meniscus
one of the small, cup-shaped nerve endings within the skin (deep epidermis, hair follicles, and hard palate); each is in contact with a single Merkel cell and they function as tactile receptors. Schematic diagram of the tactile meniscus of a nerve fiber in contact with a Merkel cell of the...

tactile receptor
a mechanoreceptor for the sense of touch; called also touch receptor.

tactometer
(tak-tom´ә-tәr) an instrument for measuring tactile sensibility; esthesiometer.

tadpole cell
strap cell..

Taenia
(te´ne-ә) a genus of tapeworm. Taenia saginata a species 4 to 8 meters long, found in the adult form in the human intestine and in the larval state in muscles and other tissues of cattle and other ruminants; human infection usually results from eating inadequately cooked be...

taenia
(te´ne-ә) a flat band or strip of soft tissue; used in anatomic nomenclature to designate various structures. a tapeworm of the genus Taenia. Defs. 1 and 2 called also tenia. taenia coli any of the three thickened bands (taenia libera, taenia mesocolica, and taenia ome...

taeniacide
(te´ne-ә-sīd″) destruction of tapeworms. an agent that kills tapeworms; called also teniacide.

taeniafuge
(te´ne-ә-fūj″) an agent that expels tapeworms; called also teniafuge.

taeniasis
(te-ni´ә-sis) infection with tapeworms of the genus Taenia.

tag
(tag) a small appendage, flap, or polyp. label. cutaneous tag acrochordon. radioactive tag radioactive label. skin tag acrochordon.

Tagamet
(tag´ә-met) trademark for preparations of cimetidine, an antagonist of histamine H2 receptors used to inhibit gastric acid secretion.

tagliacotian operation
tagliacotian rhinoplasty the reconstruction of a nose by a flap of skin taken from the arm, the flap remaining attached to the arm until union has taken place; called also Italian operation.

Tahyna virus
a virus belonging to the California serogroup of the genus Bunyavirus that causes a febrile illness in Russia and Central Europe.

tail
(tāl) any slender appendage; called also cauda. tail of spermatozoon the flagellum of a spermatozoon; it has four regions: the neck, middle piece, principal piece, and end piece.

tail bone
coccyx.

tail bud
in animals having a tail, the primordium that forms it. caudal eminence.

tail fold
a fold of the blastoderm at the caudal end of the developing embryo.

tailed bandage
a square piece of cloth cut or torn into strips from the ends toward the center, with as large a center left as necessary. The bandage is centered over a compress on the wound and the ends are then tied separately. A four-tailed bandage is useful for wounds of the nose and chin.

Takahara disease
(tah″kah-hah´rah) a severe form of acatalasia occurring in Japan.

Takayasu arteritis
Takayasu disease (tah-kah-yah´soo) Takayasu syndrome (tah-kah-yah´soo) pulseless disease.

talc
(talk) a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; used as a dusting powder. The inhalation of talc is associated with a wide variety of respiratory disorders.

talc pneumoconiosis
a type of silicatosis caused by the inhalation of talc; symptoms include shortness of breath, cough, fatigue, weakness, and weight loss. Prolonged exposure may result in pulmonary fibrosis. Called also talcosis.

talcosis
(tal-ko´sis) talc pneumoconiosis.

talcum
(tal´kәm) talc.

talipes
(tal´ĭ-pēz) a deformity in which the foot is twisted out of normal position; see also clubfoot. It may have an abnormally high longitudinal arch (talipes cavus) or it may be in dorsiflexion (talipes calcaneus), in plantar flexion (talipes equinus), abducted and everted (talipes valgus or flatfoot), adducted and inve...

talipomanus
(tal″ĭ-pom´ә-nәs) clubhand.

talocalcanean
(ta″lo-kal-ka´ne-әn) pertaining to the talus and calcaneus.

talocrural
(ta″lo-kroo´rәl) pertaining to the ankle bone (talus) and adjacent long bones of the lower limb.

talofibular
(ta″lo-fib´u-lәr) pertaining to the talus and fibula.

talonavicular
(ta″lo-nә-vik´u-lәr) pertaining to the talus and navicular bone.

talus
(ta´lәs) the highest of the tarsal bones of the foot. Together with with the tibia and fibula it forms the ankle joint.