What is "pillwort"

Pillwort \Pill"wort`\, n. (Bot.) Any plant of the genus Pilularia; minute aquatic cryptograms, with small pill-shaped fruit; -- sometimes called peppergrass.

n. (context botany English) Any plant of the genus (taxlink Pilularia genus noshow=1), a minute aquatic cryptogram with small pill-shaped fruit.

n. European water fern found around margins of bodies of water or in wet acid soil having small globose sporocarps [syn: Pilularia globulifera]