Hemihedral
(Hem`i*he"dral) a. [Hemi- + Gr. seat, base, fr. to sit.] (Crystallog.) Having half of the similar
parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as
when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of
its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained
under four of the planes of an octahedron. — Hem`i*he"dral*ly, adv.
Hemihedrism
(Hem`i*he"drism) n. (Crystallog.) The property of crystallizing hemihedrally.
Hemihedron
(Hem`i*he"dron) n. (Crystallog.) A solid hemihedrally derived. The tetrahedron is a hemihedron.
Hemiholohedral
(Hem`i*hol`o*he"dral) a. [Hemi- + holohedral.] (Crystallog.) Presenting hemihedral
forms, in which half the sectants have the full number of planes.
Hemimellitic
(Hem`i*mel*lit"ic) a. [Hemi- + mellitic.] (Chem.) Having half as many (three) carboxyl
radicals as mellitic acid; — said of an organic acid.
Hemimetabola
(||Hem`i*me*tab"o*la) n. pl. [NL. See Hemi-, and Metabola.] (Zoöl.) Those insects
which have an incomplete metamorphosis.
Hemimetabolic
(Hem`i*met`a*bol"ic) a. (Zoöl.) Having an incomplete metamorphosis, the larvæ differing
from the adults chiefly in laking wings, as in the grasshoppers and cockroaches.
Hemimorphic
(Hem`i*mor"phic) a. [Hemi- + Gr. form.] (Crystallog.) Having the two ends modified with
unlike planes; — said of a crystal.
Hemin
(He"min) n. [Gr. 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
(||He*mi"na) n.; pl. Heminæ [L., fr. Gr. .]
1. (Rom. Antiq.) A measure of half a sextary. Arbuthnot.
2. (Med.) A measure equal to about ten fluid ounces.
Hemionus
(||He*mi"o*nus) n. [NL., fr. Gr. a half ass, a mule.] (Zoöl.) A wild ass found in Thibet; the
kiang. Darwin.
Hemiopia
(||Hem`i*o"pi*a Hem`i*op"si*a) n. [NL., fr. Gr. half + Gr. sight.] (Med.) A defect of vision in
consequence of which a person sees but half of an object looked at.
Hemiorthotype
(Hem`i*or"tho*type) a. [Hemi- + Gr. straight + -type.] Same as Monoclinic.
Hemipeptone
(Hem`i*pep"tone) n. [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
(||Hem`i*ple"gi*a) n.[NL., fr. Gr. half + a stroke; cf. F. hémiplagie.] (Med.) A palsy that affects
one side only of the body. — Hem`i"pleg"ic a.
