*ophiurioid*

{ ‖‖ } n. pl. [ NL., fr. Gr. 'o`fis serpent + 'oyra` tail + e'i^dos form. ] (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. [ 1913 Webster ]