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1. Oxford American Dictionary

   warble fly

   • IPA[ˈwôrbəl flī]

   • n.
     a large fly which lays its eggs on the legs of mammals such as cattle and horses. The larvae migrate internally to the host's back, where they form a small lump with a breathing hole, dropping to the ground later when fully grown.

   • noun: warble fly, plural noun: warble flies