water hyacinth Syllabification: (wa·ter hy·a·cinth)Definition of water hyacinth noun a free-floating tropical American water plant that has been introduced elsewhere as an ornamental and in some warmer regions has become a serious weed of waterways. Eichhornia crassipes, family Pontederiaceae water hyacinth in other Oxford dictionaries Definition of water hyacinth in the British & World English dictionary
