Water nymph : A goddess of any stream or other body of water, whether one of the Naiads, Nereids, or Oceanides.

Water nymph : A water lily (Nymphaea).

Example:


Taxonomy
springs, The Water Nymph, Nereids, 1st ed, god, Greek folklore, cult, modern Greek, free encyclopedia, depiction, rivers, Artemis, divinities, Greek, New York, Ancient Greek Religion, Handbook of Greek Mythology, Greek mythology.

Defination from the web:
nymphs and related spiritual beings. ... The Water Nymph by Herbert James Draper. A nymph in Greek mythology is a female spirit typically associated with a particular location or landform. ...