From The Collaborative International Dictionary of English v.0.48: Tiercet \Tier"cet\, n. [F. tercet. See Tercet.] (Pros.) A triplet; three lines, or three lines rhyming together. [1913 Webster]
Tiercet \Tier"cet\, n. [F. tercet. See Tercet.] (Pros.) A triplet; three lines, or three lines rhyming together. [1913 Webster]