waterleaf noun5 •A tropical plant (Talinum fruticosum), the leaves of which are eaten as a vegetable.‘I like how the onions and waterleaf are slightly raw. They spice the egusi nicely, very nicely.’ — 2023 •Any plant of the genus Hydrophyllum. •Any plant of Hydrophyllaceae, the waterleaf family. •A leaf-shaped decoration used on the capitals of columns in late 12th-century Romanesque architecture •An absorbent unsized paper, somewhat like blotter paper. formswaterleafs · waterleaves