úlba or úlva (rarely as, m.), am, n. (√ uc, ‘to accumulate’, [Uṇ. iv, 95]; more probably fr. √ 1. vṛ, [BRD.]), a cover, envelope, esp. the membrane surrounding the embryo, [RV. x, 51, 1]; [AV. iv, 2, 8]; [VS.]; [TS.]; [ŚBr.] &c.; the vulva, womb, [VS. xix, 76]; a cave, cavity, [L.]; [cf. Lat. alvus, vulva; Lith. urwā, üla.]