Trigeminal \Tri*gem"i*nal\, a. [See Trigeminous.]

(Anat.) Of, pertaining to, or designating, the fifth pair of cranial nerves, which divide on each side of the head into three main branches distributed to the orbits, jaws, and parts of the mouth; trifacial.

Source: Webster's Revised Unabridged Dictionary (1913)