Tierce

tērs, n. a cask containing one-third of a pipe—that is, 42 gallons: a sequence of three cards of the same colour: ( mus. ) a third: a thrust, in fencing: ( her. ) a field tripartitely divided in three different tinctures: the third hour of the day, or the office of that hour, the terce.— ns. Tier′ceron ( arch it. ), in vaulting, a rib springing from the intersection of two other ribs; Tier′cet , a stanza of three rhymed verses, a triplet. [O. Fr. tiers , tierce —L. tertia (pars) , a third (part)— tres , three.]