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Noun: clasper  klăs-pu(r)
  1. One who, or that which, clasps, as a tendril
     
  2. A posterior extension on each of the pelvic fins of male elasmobranch fishes that aids in the transmission of sperm during copulation
     
  3. (in insects, fishes, crustaceans, etc.) one of the modified, usually paired organs or parts by which the male clasps the female during copulation

Derived forms: claspers

Encyclopedia: Clasper