Pep·per·grass n. Bot. (a) Any herb of the cruciferous genus Lepidium, especially the garden peppergrass, or garden cress, Lepidium sativum; -- called also pepperwort. All the species have a pungent flavor. (b) The common pillwort of Europe (Pilularia globulifera). See Pillwort.
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Pilularia globulifera
n : European water fern found around margins of bodies of water
or in wet acid soil having small globose sporocarps [syn:
pillwort]