Ophiuchus :: Ophiuchus (n.) A constellation in the Northern Hemisphere, delineated as a man holding a serpent in his hands; -- called also Serpentarius..
Ophiura :: Ophiura (n.) A genus of ophiurioid starfishes.
Ophiuran :: Ophiuran (a.) Of or pertaining to the Ophiurioidea.
Ophiuran :: Ophiuran (n.) One of the Ophiurioidea.
Ophiuroidea :: Ophiuroidea (n. pl.) 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..