Source : Webster's Revised Unabridged Dictionary (1913)

Hypoglossal \Hyp`o*glos"sal\, a. [Pref. hypo- + Gr. ? the
   tongue.] (Anat.)
   Under the tongue; -- applied esp., in the higher vertebrates,
   to the twelfth or last pair of cranial nerves, which are
   distributed to the base of the tongue. -- n. One of the
   hypoglossal nerves.

Source : WordNet®

hypoglossal
     n : supplies intrinsic muscles of the tongue and other tongue
         muscles [syn: {hypoglossal nerve}, {nervus hypoglosus}, {twelfth
         cranial nerve}]