/ Dictionary / Index T trochlear nerve: Meaning and Definition of Find definitions for: troch'lear nerve" Pronunciation: [key] — Anat. Anat. either one of the fourth pair of cranial nerves, consisting of motor fibers that innervate the superior oblique muscle of the upper part of the eyeball. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trochlear trochoid Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language