Source : Webster's Revised Unabridged Dictionary (1913)

Hyoid \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.

Hyoid \Hy"oid\, n.
   The hyoid bone.

Source : WordNet®

hyoid
     adj : of or relating to the hyoid bone

hyoid
     n : a U-shaped bone at the base of the tongue that supports the
         tongue muscles [syn: {hyoid bone}, {os hyoideum}]