Ulva

·noun A genus of thin papery bright green seaweeds including the kinds called sea lettuce.

ulva
ulva, ae, f. [root or-, ol-; cf. origo], sedge : Ulva conferva, Linn.; Plin. 16, 1, 1, § 4; 17, 23...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
ulva
ulva ae, f 1 OL-, swamp-grass, sedge : palustris, V.: (aper) ulvis et harundine pinguis, H., O. ...

An Elementary Latin Dictionary