noun, plural (especially collectively) starfish (especially referring to two or more kinds or species) starfishes.
any echinoderm of the class Asteroidea, having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid.
Also called sea star.

1530–40; star + fish Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
starfish (ˈstɑːˌfɪʃ)
n , pl -fish, -fishes
any echinoderm of the class Asteroidea, such as Asterias rubens, typically having a flattened body covered with a flexible test and five arms radiating from a central disc

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
starfish   (stär'fĭsh')  Pronunciation Key 
Any of various marine echinoderms of the class Asteroidea, having a star-shaped body usually with five arms. The arms have rows of little suckers on the undersides, called tube feet, with which the animal moves around and grasps prey. Many species extrude their stomach onto prey and digest it externally. Starfish can grow new arms if any are lost, and in one species, a whole individual can be regenerated from a single piece of arm. Starfish are related to sea urchins and sea cucumbers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If an arm of a starfish is cut off, you will have two starfish after
It seems to me that the outbreak of crown-of thorns starfish is a natural event.
Rays glide along the sandy bottoms while octopi, starfish, seahorses and crabs
  cling to the rocks.
Among the coral reefs swim brightly colored starfish, gentle whale sharks and
  endangered green sea turtles.
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