sea hare

noun
any gastropod of the order Aplysiacea, comprising large marine sluglike mollusks with a reduced, internal shell.

Origin:
1585–95

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World English Dictionary
sea hare
 
n
any of various marine gastropods of the order Aplysiomorpha (or Anaspidea), esp Aplysia punctata, having a soft body with an internal shell and two pairs of earlike tentacles

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

sea hare

any marine gastropod of the family Aplysiidae (subclass Opisthobranchia) that is characterized by a shell reduced to a flat plate, prominent tentacles (resembling rabbit ears), and a smooth or warty body. Sea hares eat large seaweeds. An example is the 10-centimetre (4-inch) spotted sea hare (Aplysia dactylomela), a ring-spotted green species living in grassy shallows of the Caribbean.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The sea hare, a larger cousin of the nudibranch, squirts a cloud of chemicals from its body.
Dynamics of algal secondary metabolites in two species of sea hare.
My favorite animals in the tide pools are the sea star and the sea hare.
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