Wa·ter hy·a·cinth Bot. Either of several tropical aquatic plants of the genus Eichhornia, related to the pickerel weed.
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water hyacinth
n : a tropical floating aquatic plant having spikes of large
blue flowers; troublesome in clogging waterways
especially in southern United States [syn: water orchid,
Eichhornia crassipes, Eichhornia spesiosa]