1. (noun)water hyacinth, water orchid, Eichhornia crassipes, Eichhornia spesiosa a tropical floatingaquaticplant having spikes of largeblue flowers; troublesome in clogging waterways especially in southern United States
Definitions of 'water hyacinth'
Webster 1913 Dictionary
1. water hyacinth either of several tropical aquatic plants of the genus Eichhornia, related to the pickerelweed