Source : Webster's Revised Unabridged Dictionary (1913)

Pepperwort \Pep"per*wort`\, n. (Bot.)
   See {Peppergrass}.

Source : WordNet®

pepperwort
     n 1: any of several water ferns of the genus Marsilea having four
          leaflets [syn: {clover fern}]
     2: annual herb used as salad green and garnish [syn: {common
        garden cress}, {garden pepper cress}, {pepper grass}, {Lepidium
        sativum}]