Definition of thresher shark
: a large nearly cosmopolitan shark (Alopias vulpinus) that has a greatly elongated curved upper lobe of the tail which is often used to thresh the water to round up the schooling fish on which it feeds — see shark illustration
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Merriam-Webster unabridged
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Time Traveler for thresher shark
The first known use of thresher shark was in 1888
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