water soldier

noun

an aquatic plant, Stratiotes aloides, of Europe and NW Asia, having rosettes of large leaves and large three-petalled white flowers: family Hydrocharitaceae

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for water soldier

Historical Examples of water soldier

White water-crowfoot, water-soldier, and arrowheads will form the fringe of the pool.
The Naturalist on the Thames
C. J. Cornish