Tĕr'e-brăt'ū-lă, n.

noun

n.; pl. TĚR'Ē-BRĂT'Ū-LÆ. [N. Lat., Fr. térèbratule.] (Zool.) A genus of bivalve mollusks, of the order of Brachiopods, in which one of the valves is perforated for the transmission of a tendinous ligament, by which the animal fixes itself to submarine bodies.

Two illustrations of ribbed brachiopod shells, shown from different angles. — a, b, Terebratulæ.