whale shark

noun
a tropical shark, Rhincodon typus, ranging in size from 30 to 60 feet (9 to 18 meters), having small teeth and a sievelike structure over its gills for catching plankton.

Origin:
1880–85

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World English Dictionary
whale shark
 
n
a large spotted whalelike shark, Rhincodon typus, of warm seas, that feeds on plankton and small animals: family Rhincodontidae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Recently as a local you might of hear of the whale shark through the cut and
  things of that.
Several companies can arrange for you to swim alongside the harmless whale
  shark, the world's largest fish.
Get lucky, and you may get to snorkel with a whale shark, a harmless fish that
  eats plankton.
For example, the giant whale shark feasts on these puny animals.
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