Water grass. (a) A tall march perennial grass (Paspalum dilatatum) of the southern United States and the American tropics. (b) Manna grass. (c) The grass Chloris elegans. (d) (1) Velvet grass. (2) The water cress. (3) One of various horsetails.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.