any of various stout-bodied hairy dipterous flies of the families Oestridae and Gasterophilidae, the larvae of which are parasites of humans, sheep, and horses
botfly in American English
(ˈbɑtˌflaɪ)
nounWord forms: pluralˈbotˌflies
any of a number of dipterous flies (families Cuterebridae, Gasterophilidae, and Oestridae)resembling small bumblebees: the larvae are parasitic in people, horses, sheep, andother mammals