a. and sb. Anc. Pros. [ad. Gr. τρίσημος, f. τρι-, TRI- + σῆμα sign.] a. adj. = trisemic (see below). b. sb. A trisemic foot. So Trisemic a., containing, consisting of, or equivalent to three moræ or short syllables.
1885. Goodell, in Trans. Amer. Philol. Assoc., XVI. 88. This metre is logaœdic, trisemes and cyclic dactyls, as well as tribrachs and inverted trochees, being substituted freely for pure trochees.
1894. Gildersleeve, Lat. Gram. (ed. 3), 459. Syncopé and Protraction (triseme long).
