\Hy"oid\, a. [Gr. ? fr. the letter [Upsilon] + ? form: cf.
F. hyo["i]de.]
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.