(Hy"o-) [See Hyod.] A prexif used in anatomy, and generally denoting connection with the hyoid
bone or arch; as, hyoglossal, hyomandibular, hyomental, etc.
(||Hy`o*ga*noi"de*i) n. pl. [NL. See Hyo-, and Canoidei.] (Zoöl.) A division of ganoid
fishes, including the gar pikes and bowfins. Hy`o*ga"noid a.
(Hy`o*glos"sal) a. [Hyo- + Gr. tongue.] (Anat.) (a) Pertaining to or connecting the tongue
and hyodean arch; as, the hyoglossal membrane. (b) Of or pertaining to the hyoglossus muscle.
(||Hy`o*glos"sus) n. [NL., fr. hyo- hyo- + Gr. glw^ssa tongue.] (Anat.) A flat muscle on
either side of the tongue, connecting it with the hyoid bone.
(Hy"oid) a. [Gr. fr. the letter &UPSILON + form: cf. F. hyoïde.]
1. Having the form of an arch, or of the Greek letter upsilon [&UPSILON].
2. (Anat.) Of or pertaining to the bony or cartilaginous arch which supports the tongue. Sometimes
applied to the tongue itself.
Hyoid arch (Anat.), the arch of cartilaginous or bony segments, which connects the base of the tongue
with either side of the skull. Hyoid bone (Anat.), the bone in the base of the tongue, the middle
part of the hyoid arch.
(Hy"oid), n. The hyoid bone.
(Hy*oid"e*al Hy*oid"e*an) a. Same as Hyoid, a.
(Hy`o*man*dib"u*lar) a. [Hyo- + mandibular.] (Anat.) Pertaining both to the hyoidean
arch and the mandible or lower jaw; as, the hyomandibular bone or cartilage, a segment of the hyoid
arch which connects the lower jaw with the skull in fishes. n. The hyomandibular bone or cartilage.
(Hy`o*men"tal) a. [Hyo- + mental of the chin.] (Anat.) Between the hyoid bone and the
lower jaw, pertaining to them; suprahyoid; submaxillary; as, the hyomental region of the front of the neck.
(Hy`o*pas"tron) n. [Hyo- + plastron.] (Zoöl.) The second lateral plate in the plastron of
turtles; called also hyosternum.
(Hy*os"cine) n. [See Hyoscyamus.] (Chem.) An alkaloid found with hyoscyamine (with
which it is also isomeric) in henbane, and extracted as a white, amorphous, semisolid substance.
(Hy`os*cy"a*mine) n. [See Hyoscyamus.] (Chem.) An alkaloid found in henbane and
regarded as its active principle. It is also found with other alkaloids in the thorn apple and deadly nightshade.
It is extracted as a white crystalline substance, with a sharp, offensive taste. Hyoscyamine is isomeric
with atropine, is very poisonous, and is used as a medicine for neuralgia, like belladonna. Called also
hyoscyamia, duboisine, etc.