blow fly

noun
1.
any of numerous dipterous insects of the family Calliphoridae that deposit their eggs or larvae on carrion, excrement, etc., or in wounds of living animals.
Also, blowfly.
Origin
1815-25
British Dictionary definitions for blowfly

blowfly

/ˈbləʊˌflaɪ/
noun (pl) -flies
1.
any of various dipterous flies of the genus Calliphora and related genera that lay their eggs in rotting meat, dung, carrion, and open wounds: family Calliphoridae Also called bluebottle