triportentum

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

trĭ-portentum, i, n. [ter],

an extraordinary omen or portent : deūm triportenta. Pac. ap. Varr. L. L. 7, § 59 Müll. (Trag. Rel. v. 381 Rib.).