WordReference Random House Unabridged Dictionary of American English © 2026
sea′ but′terfly, 
  1. Invertebratesany member of the gastropod order Pteropoda, shelled marine mollusks so called for their ability to swim using winglike extensions of the foot.
  • 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::
sea butterfly
  1. another name for pteropod
'sea butterfly' also found in these entries (note: many are not synonyms or translations):
pteropod

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