Hemiholohedral adjective [ Hemi- + holohedral .] (Crystallog.) Presenting hemihedral forms, in which half the sectants have the full number of planes.

Hemimellitic adjective [ Hemi- + mellitic .] (Chemistry) Having half as many ( three ) carboxyl radicals as mellitic acid; -- said of an organic acid.

Hemimetabola noun plural [ New Latin See Hemi- , and Metabola .] (Zoology) Those insects which have an incomplete metamorphosis.

Hemimetabolic adjective (Zoology) Having an incomplete metamorphosis, the larvæ differing from the adults chiefly in laking wings, as in the grasshoppers and cockroaches.

Hemimorphic adjective [ Hemi- + Greek ... form.] (Crystallog.) Having the two ends modified with unlike planes; -- said of a crystal.

Hemin noun [ Greek a"i^ma blood.] (Physiol. Chem.) A substance, in the form of reddish brown, microscopic, prismatic crystals, formed from dried blood by the action of strong acetic acid and common salt; -- called also Teichmann's crystals. Chemically, it is a hydrochloride of hematin.

» The obtaining of these small crystals, from old blood clots or suspected blood stains, constitutes one of the best evidences of the presence of blood.

Hemina noun ; plural Heminæ . [ Latin , from Greek ....]
1. (Rom. Antiq.) A measure of half a sextary. Arbuthnot.

2. (Medicine) A measure equal to about ten fluid ounces.

Hemionus noun [ New Latin , from Greek ... a half ass, a mule.] (Zoology) A wild ass found in Thibet; the kiang. Darwin.

Hemiopia, Hemiopsia noun [ New Latin , from Greek ... half + Greek ... sight.] (Medicine) A defect of vision in consequence of which a person sees but half of an object looked at.

Hemiorthotype adjective [ Hemi- + Greek ... straight + -type .] Same as Monoclinic .

Hemipeptone noun [ Hemi- + peptone .] (Physiol. Chem.) A product of the gastric and pancreatic digestion of albuminous matter.

» Unlike antipeptone it is convertible into leucin and tyrosin, by the continued action of pancreatic juice. See Peptone . It is also formed from hemialbumose and albumin by the action of boiling dilute sulphuric acid.

Hemiplegia noun [ New Latin , from Greek ...; ... half + ... a stroke; confer French hémiplagie .] (Medicine) A palsy that affects one side only of the body. -- Hem`i"pleg"ic adjective

Hemiplegy noun (Medicine) Hemiplegia.

Hemipode noun [ Hemi- + Greek ..., ..., foot.] (Zoology) Any bird of the genus Turnix . Various species inhabit Asia, Africa, and Australia.

Hemiprotein noun [ Hemi- + protein .] (Physiol. Chem.) An insoluble, proteid substance, described by Schützenberger, formed when albumin is heated for some time with dilute sulphuric acid. It is apparently identical with antialbumid and dyspeptone.

Hemipter noun [ Confer French hémiptères , plural] (Zoology) One of the Hemiptera.

Hemiptera noun plural [ New Latin , from Greek ... half + ... wing, from ... to fly.] (Zoology) An order of hexapod insects having a jointed proboscis, including four sharp stylets (mandibles and maxillæ), for piercing. In many of the species (Heteroptera) the front wings are partially coriaceous, and different from the others.

» They are divided into the Heteroptera , including the squash bug, soldier bug, bedbug, etc.; the Homoptera , including the cicadas, cuckoo spits, plant lice, scale insects, etc.; the Thysanoptera , including the thrips, and, according to most recent writers, the Pediculina or true lice.

Hemipteral, Hemipterous adjective (Zoology) Of or pertaining to the Hemiptera.

Hemipteran noun (Zoology) One of the Hemiptera; an hemipter.

Hemisect transitive verb [ imperfect & past participle Hemisected ; present participle & verbal noun Hemisecting .] [ Hemi- + Latin secare to cut.] (Anat.) To divide along the mesial plane.

Hemisection noun (Anat.) A division along the mesial plane; also, one of the parts so divided.

Hemisphere noun [ Latin hemisphaerium , Greek ...; ... half = ... sphere: confer French hémisphère . See Hemi- , and Sphere .]
1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center.

2. Half of the terrestrial globe, or a projection of the same in a map or picture.

3. The people who inhabit a hemisphere.

He died . . . mourned by a hemisphere .

J. P. Peters.

Cerebral hemispheres . (Anat.) See Brain . -- Magdeburg hemispheres (Physics) , two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air. So called because invented by Otto von Guericke at Magdeburg .

Hemispheric, Hemispherical adjective [ Confer French hémisphérique .] Containing, or pertaining to, a hemisphere; as, a hemispheric figure or form; a hemispherical body.

Hemispheroid noun [ Hemi- + spheroid .] A half of a spheroid.

Hemispheroidal adjective Resembling, or approximating to, a hemisphere in form.

Hemispherule noun A half spherule.

Hemistich noun [ Latin hemistichium , Greek "hmisti`chion ; "hmi- half + sti`chos row, line, verse: confer French hémistiche .] Half a poetic verse or line, or a verse or line not completed.

Hemistichal adjective Pertaining to, or written in, hemistichs; also, by, or according to, hemistichs; as, a hemistichal division of a verse.

Hemisystole noun (Physiol.) Contraction of only one ventricle of the heart.

» Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole .

Hemitone noun [ Latin hemitonium , Greek ....] See Semitone .

Hemitropal, Hemitropous adjective [ See Hemitrope .]
1. Turned half round; half inverted.

2. (Botany) Having the raphe terminating about half way between the chalaza and the orifice; amphitropous; -- said of an ovule. Gray.

Hemitrope adjective [ Hemi- + Greek ... to turn: confer French hémitrope .] Half turned round; half inverted; (Crystallog.) having a twinned structure.

Hemitrope noun That which is hemitropal in construction; (Crystallog.) a twin crystal having a hemitropal structure.

Hemitropy noun (Crystallog.) Twin composition in crystals.

Hemlock noun [ Middle English hemeluc , humloc , Anglo-Saxon hemlic , hymlic .]
1. (Botany) The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata , bulbifera , and virosa , and the Conium maculatum . See Conium .

» The potion of hemlock administered to Socrates is by some thought to have been a decoction of Cicuta virosa , or water hemlock , by others, of Conium maculatum .

2. (Botany) An evergreen tree common in North America ( Abies, or Tsuga, Canadensis ); hemlock spruce.

The murmuring pines and the hemlocks .

Longfellow.

3. The wood or timber of the hemlock tree.

Ground hemlock , or Dwarf hemlock . See under Ground .

Hemmel noun [ Scot. hemmel , hammel , Prov. English hemble hovel, stable, shed, perhaps allied to Dutch hemel heaven, canopy, German himmel ; confer English heaven . √14.] A shed or hovel for cattle. [ Prov. Eng.] Wright.

Hemmer noun One who, or that which, hems with a needle. Specifically: (a) An attachment to a sewing machine, for turning under the edge of a piece of fabric, preparatory to stitching it down. (b) A tool for turning over the edge of sheet metal to make a hem.

Hemo- Same as Hæma- , Hæmo- .

Hemoglobin noun [ Hemo- + globe .] (Physiol.) The normal coloring matter of the red blood corpuscles of vertebrate animals. It is composed of hematin and globulin, and is also called hæmatoglobulin . In arterial blood, it is always combined with oxygen, and is then called oxyhemoglobin . It crystallizes under different forms from different animals, and when crystallized, is called hæmatocrystallin . See Blood crystal , under Blood .

Hemoglobinometer noun (Physiol. Chem.) Same as Hæmochromometer .

Hemophilia noun See Hematophilia .

Hemoptysis noun [ New Latin , from Greek a"i^ma blood + ... to spit: confer French hémoptysie .] (Medicine) The expectoration of blood, due usually to hemorrhage from the mucous membrane of the lungs.

Hemorrhage noun [ Latin haemorrhagia , Greek a"imorragi`a ; a"i^ma blood + "rhgny`nai to break, burst: confer French hémorragie , hémorrhagie .] (Medicine) Any discharge of blood from the blood vessels.

» The blood circulates in a system of closed tubes, the rupture of which gives rise to hemorrhage.

Hemorrhagic adjective [ Greek a"imorragiko`s : confer French hémorrhagique .] Pertaining or tending to a flux of blood; consisting in, or accompanied by, hemorrhage.

Hemorrhoidal adjective [ Confer French hémorroïdal , hémorrhoïdal .]
1. Of or pertaining to, or of the nature of, hemorrhoids.

2. (Anat.) Of or pertaining to the rectum; rectal; as, the hemorrhoidal arteries, veins, and nerves.

Hemorrhoids noun plural [ Latin haemorrhoidae , plural, Greek ..., sing., ... (sc. ...), plural, veins liable to discharge blood, hemorrhoids, from ... flowing with blood; a"i^ma blood + ... to flow: confer French hémorroïdes , hémorrhoïdes . See Rheum .] (Medicine) Livid and painful swellings formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus is occasionally discharged; piles; emerods. [ The sing. hemorrhoid is rarely used.]

Hemostatic adjective [ Hemo- + Greek statiko`s causing to stand, from ... to stand.]
1. (Medicine) Of or relating to stagnation of the blood.

2. Serving to arrest hemorrhage; styptic.

Hemostatic noun A medicine or application to arrest hemorrhage.

Hemothorax noun [ New Latin See Hemo- , and Thorax .] (Medicine) An effusion of blood into the cavity of the pleura.

Hemp (hĕmp) noun [ Middle English hemp , Anglo-Saxon henep , hænep ; akin to Dutch hennep , Old High German hanaf , German hanf , Icelandic hampr , Danish hamp , Swedish hampa , Latin cannabis , cannabum , Greek ka`nnabis , ka`nnabos ; confer Russian konoplia , Sanskrit çana ; all probably borrowed from some other language at an early time. Confer Cannabine , Canvas .]
1. (Botany) A plant of the genus Cannabis ( C. sativa ), the fibrous skin or bark of which is used for making cloth and cordage. The name is also applied to various other plants yielding fiber.

2. The fiber of the skin or rind of the plant, prepared for spinning. The name has also been extended to various fibers resembling the true hemp.

African hemp , Bowstring hemp . See under African , and Bowstring . -- Bastard hemp , the Asiatic herb Datisca cannabina . -- Canada hemp , a species of dogbane ( Apocynum cannabinum ), the fiber of which was used by the Indians. -- Hemp agrimony , a coarse, composite herb of Europe ( Eupatorium cannabinum ), much like the American boneset. -- Hemp nettle , a plant of the genus Galeopsis ( G. Tetrahit ), belonging to the Mint family. -- Indian hemp . See under Indian , adjective -- Manila hemp , the fiber of Musa textilis . -- Sisal hemp , the fiber of Agave sisalana , of Mexico and Yucatan. -- Sunn hemp , a fiber obtained from a leguminous plant ( Crotalaria juncea ). -- Water hemp , an annual American weed ( Acnida cannabina ), related to the amaranth.