water nymph

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A nymph, such as a naiad or Nereid, living in or near water.

from The Century Dictionary.

• noun Any dragon-fly.
• noun A Naiad.
• noun A plant of the genus Naias.
• noun The water-lily, Castalia (Nymphæa).

from the GNU version of the Collaborative International Dictionary of English.

• (Myth.) A goddess of any stream or other body of water, whether one of the Naiads, Nereids, or Oceanides.
• (Bot.) A water lily (Nymphæa).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a fairy that inhabits water
• noun submerged aquatic plant having narrow leaves and small flowers; of fresh or brackish water
• noun (Greek mythology) any nymph of the water
• noun a water lily having large leaves and showy fragrant flowers that float on the water; of temperate and tropical regions