[f. Gr. τριώνυμ-ος having three names, f. τρι-, TRI- + ὄνομα name.] A name consisting of three terms; a trinomial name in botany or zoology; TRINOMIAL B. 2. So Trionymal a. = TRINOMIAL A. 2, TRINOMINAL.

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1656.  Blount, Glossogr., Trionimal..., that hath three names.

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[1691.  Tomlinson, in Ray, N. C. Words, s.v. Brock, The animal is trionymus, badger, brock, or gray.]

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1884.  Coues, in Auk, Oct., 321. Tronym, an onym consisting of three terms.

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1884.  J. A. Allen, ibid., 352. Even a trinomial (or trionymal) system … fails to meet the requirements of the case.

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