'Waterwort' definitions:

Definition of 'Waterwort'

From: GCIDE

Waterwort \Wa"ter*wort`\, n. (Bot.) Any plant of the natural order Elatineae, consisting of two genera (Elatine, and Bergia), mostly small annual herbs growing in the edges of ponds. Some have a peppery or acrid taste. [1913 Webster]