Rich·weed n. Bot. An herb (Pilea pumila) of the Nettle family, having a smooth, juicy, pellucid stem; -- called also clearweed.
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  richweed
       n 1: erect perennial strong-scented with serrate pointed leaves
            and a loose panicle of yellowish flowers; the eastern
            United States [syn: horse balm, horseweed, stoneroot,
             stone-root, stone root, Collinsonia canadensis]
       2: a plants of the genus Pilea having drooping green flower
          clusters and smooth translucent stems and leaves [syn: clearweed,
           dead nettle, Pilea pumilla]