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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.