The Collaborative International Dictionary of English v.0.48:
Hydrophyte \Hy"dro*phyte\, n. [Gr. ? + ? plant: cf. F. hydrophyte.] An aquatic plant; an alga. [1913 Webster]WordNet (r) 3.0 (2006):
hydrophyte n 1: a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth [syn: aquatic plant, water plant, hydrophyte, hydrophytic plant]