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Definition of Sea star
1. Noun. Echinoderms characterized by five arms extending from a central disk.
Exact synonyms: Starfish
Generic synonyms: Echinoderm
Group relationships: Asteroidea, Class Asteroidea
Generic synonyms: Echinoderm
Group relationships: Asteroidea, Class Asteroidea
Definition of Sea star
1. Noun. Another name for starfish. ¹
¹ Source: wiktionary.com
Medical Definition of Sea star
1.