Lewis & Short

ūraeus, a, um, adj., = οὐραῖος, of or belonging to the tail: cybia, tail-pieces of tunny-fish, Plin. 32, 11, 53, § 151 (dub.; Jahn, terna cybia); cf. uraeon = οὐραῖον, fishtail, Varr. L. L. 5, § 77 Müll.