01 n. A fresh-water weed of the frog's-bit family (Hydrocharidaceae), native to America. Transferred to England it became an obstruction to navi…
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A fresh-water weed of the frog's-bit family (Hydrocharidaceae), native to America. Transferred to England it became an obstruction to navigation. Called also waterweed and water thyme.(Bot.) Also: waterweed, water thyme