Etymology
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starfish (n.)

also star-fish, 1530s, from star (n.) + fish (n.). Greek astēr also was "a starfish."

updated on January 02, 2022

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Definitions of starfish from WordNet

starfish (n.)
echinoderms characterized by five arms extending from a central disk;
Synonyms: sea star
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.