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Any of various plants of the genus Lepidium of the mustard family, having small whitish flowers and pungent leaves, and including the garden cress. Also called peppercress, pepperwort.
1. (Plants) any of various temperate and tropical aquatic or marsh ferns of the genus Marsilea, having floating leaves consisting of four leaflets: family Marsileaceae
2. (Plants) any of several plants of the genus Lepidium, esp L. campestre, of dry regions of Eurasia, having small white flowers and pungent seeds: family Brassicaceae (crucifers). Also called (in Britain and certain other countries): pepperwort