| pillworm | <zoology> Any myriapod of the genus Iulus and allied genera which rolls up spirally; a galleyworm. Source: Websters Dictionary (01 Mar 1998) |
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| pillwort | <botany> Any plant of the genus Pilularia; minute aquatic cryptograms, with small pill-shaped fruit; sometimes called peppergrass. Source: Websters Dictionary (01 Mar 1998) |