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  • Webster's Revised Unabridged Dictionary
    • a Trifacial (Anat) See Trigeminal.
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Century Dictionary and Cyclopedia
    • trifacial Of or pertaining to the face in a threefold manner: specifically applied to the fifth cranial nerve, or trigeminus, which divides into three main branches to supply the face and some other parts, and has the threefold function of a nerve of motion, of common sensation, and of special sense (gustatory). Also called trigeminal, upon other considerations. The term trifacial is contrasted with facial, applied to the seventh cranial nerve, the main motor nerve of the muscles of the face. See facial.
    • trifacial Of or pertaining to the trifacial nerve.
    • n trifacial The trigeminal nerve. In man this is the largest cranial nerve, and resembles a spinal nerve in some respects, arising by two roots, a small anterior simple motor root and a large posterior ganglionated sensory root. The superficial or apparent origin from the brain is from the side of the pons Varolii, where the two roots come off together. It passes to a depression npon the end of the petrosal bone, where the sensory fibers form the large semilunar ganglion known as the Gasserian; the motor fibers accompany but do not enter into the formation of this ganglion. Beyond the ganglion the nerve immediately divides into three main branches, the ophthalmic, supramaxillary, and inframaxillary, which leave the cranial cavity separately, respectively by the foramen lacerum anterius, foramen rotundum, and foramen ovale of the sphenoid bone. The motor fibers supply the muscles of mastication. The character of the nerve varies much in the vertebrate series. See cuts under brain, Cyclodus, Esox, and Petromyzontidæ.
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Chambers's Twentieth Century Dictionary
    • Trifacial trī-fā′shal threefold and pertaining to the face, esp. of the fifth cranial nerve
    • n Trifacial the trigeminal nerve
    • ***


Webster's Revised Unabridged Dictionary
Pref. tri-, + facial,


In literature:

I want these facts partly to throw light on the marvellous laburnum Adami, trifacial oranges, etc.
"The Life and Letters of Charles Darwin, Volume II (of II)" by Charles Darwin
What is the trifacial nerve sometimes called?
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter