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WordReference Random House Unabridged Dictionary of American English © 2024wa′ter hy′acinth, - Plant Biologya floating aquatic plant, Eichornia crassipes, of tropical lakes and rivers, that grows so prolifically it often hinders the passage of boats.
Collins Concise English Dictionary © HarperCollins Publishers:: water hyacinth n - a floating aquatic plant, Eichhornia crassipes, of tropical America, having showy bluish-purple flowers and swollen leafstalks: family Pontederiaceae. It forms dense masses in rivers, ponds, etc, and is a serious problem in the southern US, Australia, and parts of Africa
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