Definition of clasper
: a male copulatory structure:
a
: one of a pair of external anal processes of an insect that are used to grasp a female
b
: one of a pair of organs that are extensions of the pelvic fins of cartilaginous fishes
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Merriam-Webster unabridged
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Time Traveler for clasper
The first known use of clasper was circa 1847
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