[trahy-jem-uh-nl] Anatomy.
of or pertaining to the trigeminal nerve.
Also called trigeminal nerve. either one of the fifth pair of cranial nerves, consisting of motor fibers that innervate the muscles of mastication, and of sensory fibers that conduct impulses from the head and face to the brain.

1820–30; < Neo-Latin trigemin(us) (Latin: triple, equivalent to tri- tri- + geminus twin, double) + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trigeminal (traɪˈdʒɛmɪnəl)
anatomy of or relating to the trigeminal nerve
[C19: from Latin trigeminus triplet, from tri- + geminus twin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

trigeminal tri·gem·i·nal (trī-jěm'ə-nəl)
Of or relating to the trigeminal nerves.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The reason may be that capsaicin excites the trigeminal nerve, increasing the body's receptiveness to the flavour of other foods.
They are also suffused with branches of the trigeminal nerve, which carries information from the senses to the brain.
Most sources believe the optic nerve somehow crosses with the trigeminal nerve, which corresponds with sneeze production.
By some not completely understood mechanism, the trigeminal nerve is also involved.
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