|n. pl.||1.||(Zool.) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; - called also Ophiuroida and Ophiuridea. See Illust. under Brittle star.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.