Sea butterfly | definition of sea butterfly by Medical dictionary
pteropod (redirected from sea butterfly)
Also found in: Dictionary
Fig. 261 Pteropod . General morphology.
sea butterfly a small gastropod mollusc found in the plankton, with the foot modified into wing-like structures used for swimming. Pteropods are known as ‘sea butterflies’ because of the appearance given to them by these expansions of the foot.