Thresher

A thresher is a device that first separates the head of a stalk of grain from the straw, and then further separates the kernel from the rest of the head.

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A thresher is a type of shark, harmless to man and easily recognizable because its tail is longer than the combined length of body and head.

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USS Thresher has been the name of two United States Navy submarines: SS-200 and SSN-593.

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