Source : Webster's Revised Unabridged Dictionary (1913)

Ophiurioidea \O`phi*u`ri*oi"de*a\, Ophiuroidea
\O`phi*u*roi"de*a\, n. pl. [NL., fr. Gr. ? serpent + ? tail + ?
   form.] (Zo["o]l.)
   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}.