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trigeminal (adj.)

1815, from Latin trigeminus "born in threes," as a noun, "triplets;" from tri- (see tri-) + geminus "born at the same birth" (see geminate (adj.)).

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Definitions of trigeminal from WordNet

trigeminal (n.)
the main sensory nerve of the face and motor nerve for the muscles of mastication;
Synonyms: trigeminal nerve / trigeminus / nervus trigeminus / fifth cranial nerve
From wordnet.princeton.edu