The Collaborative International Dictionary
water thyme
Anacharis \An*ach"a*ris\, n. [NL., fr. Gr. ? up + ? grace.] (Bot.) A fresh-water weed of the frog's-bit family ( Hydrocharidace[ae]), native to America. Transferred to England it became an obstruction to navigation. Called also waterweed and water thyme.
Usage examples of "water thyme".
And some think that he feeds on water thyme, and smells of it at his first taking out of the water.