1. Us any of a genus (Pontederia) of North American aquatic plants of the pickerelweed family, esp. a species (P. cordata) with arrow-shaped leaves and spikes of blue-violet flowers, found in shallow waters
2. designating a family (Pontederiaceae, order Liliales) of monocotyledonous, freshwater plants,
including the water hyacinth
Webster’s New World College Dictionary, Fourth Edition, compiled by the
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