belonging or pertaining to the Pteropoda, a group of mollusks having the lateral portions of the foot expanded into winglike lobes used in swimming.
a pteropod mollusk.

1825–35; < Neo-Latin Pteropoda (plural); see ptero-, -pod Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pteropod (ˈtɛrəˌpɒd)
Also called: sea butterfly any small marine gastropod mollusc of the group or order Pteropoda, in which the foot is expanded into two winglike lobes for swimming and the shell is absent or thin-walled

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


small marine gastropods of the subclass Opisthobranchia having a pair of winglike flaps (parapodia) that are used for swimming. These gastropods were once grouped as the order Pteropoda. They live at or near the sea surface; most are less than 1 cm (0.4 inch) long.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Experiments show that pteropod shells grow more slowly in acidified seawater.
One type of free-swimming mollusk called a pteropod is eaten by organisms ranging in size from tiny krill to whales.
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