Thresher shark

thresher

[thresh-er]
noun
1.
a person or thing that threshes.
2.
Also, thrasher. Also called thresher shark. a large shark of the genus Alopias, especially A. vulpinus, which threshes the water with its long tail to drive together the small fish on which it feeds.

Origin:
1350–1400; Middle English thressher. See thresh, -er1

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World English Dictionary
thresher (ˈθrɛʃə)
 
n
1.  a person who threshes
2.  short for threshing machine
3.  thrasher, Also called: thresher shark any of various large sharks of the genus Alopias, esp A. vulpinus, occurring in tropical and temperate seas: family Alopiidae. They have a very long whiplike tail with which they are thought to round up the small fish on which they feed

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