Definition of sea butterfly in English:

sea butterfly


  • A small mollusc with winglike extensions to its body which it uses for swimming.

    Orders Thecosomata (with shells) and Gymnosomata (lacking shells), class Gastropoda

    • ‘The divers visit a small skerrig surrounded by a kelp forest with nudibranchs, comb jellyfish and sea butterflies.’
    • ‘These all feed on pteropods, or sea butterflies, one of the species most threatened by rising acidity.’
    • ‘The opisthobranchs include the sea slugs and their relatives the sea hares, sea butterflies, canoe shells, and others.’