whale shark

the only species (Rhiniodon typus) of a family (Rhiniodontidae, order Orectolobiformes) of huge, spotted, egg-laying sharks that live in warm seas, have many small teeth, and feed on plankton and small fishes by means of gill strainers: the largest of fishes, often reaching 15 m (c. 50 ft) in length

See whale shark in American Heritage Dictionary 4

noun
A very large shark (Rhincodon typus) of warm marine waters, having a spotted body, small teeth, and a network of rakelike sieves extending from its gills for straining plankton from the water.

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