sea butterfly

English

Noun

sea butterfly (plural sea butterflies)

  1. Any of the suborder Thecosomata of small pelagic sea snails.
    Synonym: pteropod
    • 2012, Caspar Henderson, The Book of Barely Imagined Beings, Granta Books, published 2013, page 284:
      Sea butterflies are pteropods: sea snails that swim by flapping pad-like ‘feet’ which have grown into wings.

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