A nymph is a young female deity in Greek and Roman mythology, often associated with natural features or divine retinues. Learn about their origins, roles, affairs, and cults in this comprehensive article. Nymphs are minor female deities in ancient Greek folklore, associated with specific places, landforms, or trees. They have various powers and habits, and are often lovers or attendants of gods and heroes. Definition of nymph noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. There are ten meanings listed in OED's entry for the noun nymph, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.