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trionymal
trionymal adj. 
/traɪˈɒnɪməl/ = trinomial adj. 2, trinominal adj.
/traɪˈɒnɪməl/ = trinomial adj. 2, trinominal adj.ΘΚΠ
the mind > language > naming > [adjective] > having three names
trinominal1674
trinomial1865
trionymal1884
1656 T. Blount Glossographia Trionimal.., that hath three names.
1884 J. A. Allen in Auk Oct. 352 Even a trinomial (or trionymal) system..fails to meet the requirements of the case.
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