Starfish

n. marine invertebrate having a thick spiny body and five or more arms

Starfish or sea stars are any echinoderms belonging to the class Asteroidea. The names sea star and starfish are also (incorrectly) used for the closely related brittle stars, which make up the class Ophiuroidea.Starfish exhibit a superficially radial symmetry. They typically have five or more "arms" which radiate from an indistinct disk (pentaradial symmetry). However, the evolutionary ancestors of echinoderms are believed to have had bilateral symmetry. Starfish do exhibit some superficial remnant of this body structure, evident in their larval pluteus forms.
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Noun
1. echinoderms characterized by five arms extending from a central disk
(synonym) sea star
(hypernym) echinoderm
(member-holonym) Asteroidea, class Asteroidea

(n.)
The dollar fish, or butterfish.
  

(n.)
Any one of numerous species of echinoderms belonging to the class Asterioidea, in which the body is star-shaped and usually has five rays, though the number of rays varies from five to forty or more. The rays are often long, but are sometimes so short as to appear only as angles to the disklike body. Called also sea star, five-finger, and stellerid.
  

starfish /'stɑ:fiʃ/
danh từ (động vật học) sao biển
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