The Collaborative International Dictionary
Water can
Water can \Wa"ter can`\ (Bot.)
Any one of several species of Nuphar; the yellow frog lily;
-- so called from the shape of the seed vessel. See Nuphar,
and cf. Candock.
--Dr. Prior.
Wiktionary
water can
n. 1 (&lit water can English) 2 Any of several species of ''Nuphar''; the (vern yellow frog lily pedia=1); so called from the shape of the seed vessel.