Märsh'-pĕn'ny-wort, n.

(pĕn'nĭ-wŏrt), n. (Bot.) A plant of several species of the genus Hydrocotyle, especially H. vulgaris. It is a low, smooth, creeping perennial, with slender stems, small white flowers, and round or kidney-shaped leaves of about the size of a penny, lying flat on the marshy ground.