any of several flies of the families Oestridae, Gasterophilidae, and Cuterebridae, the larvae of which are parasitic in the skin or other parts of various mammals.
bot·fly also bot fly (bŏt'flī') n. Any of various stout, two-winged flies, chiefly of the genera Gasterophilus and Oestrus, having larvae that are parasitic on various animals, especially horses and sheep, and sometimes on humans.
Main Entry: bot·fly Pronunciation: 'bät-"flI Function: noun Inflected Form: plural-flies : any of various stout dipteranflies of the family Oestridae that have larvae parasitic in cavities or tissues of various mammals including humans
botfly bot·fly (bŏt'flī') n. A robust hairy fly of the order Diptera whose larvae produce a variety of myiasis conditions in humans and various domestic animals.