TERCET
three, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace
(noun) the cardinal number that is the sum of one and one and one
Source: WordNet® 3.1
Noun
tercet (plural tercets)
a three-line stanza in a poem
Source: Wiktionary
Ter"cet, n. Etym: [F., fr. It. terzetto, dim. of terzo, third, L.
tertius. See Tierce, and cf. Terzetto.]
1. (Mus.)
Definition: A triplet. Hiles.
2. (Poetry)
Definition: A triplet; a group of three lines.
Source: Webster’s Unabridged Dictionary 1913 Edition