water nymph

WordReference Random House Unabridged Dictionary of American English © 2026

wa′ter nymph′, 

1. a nymph of the water, as a naiad, a Nereid, or an Oceanid.
2. Plant Biology See water lily. 
3. Plant Biology any aquatic plant of the genus Najas, having narrow, opposite leaves.
• Middle English 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

water nymph noun

1. any fabled nymph of the water, such as the Naiad, Nereid, or Oceanid of Greek mythology