blue·bot·tle / ˈbloōˌbätl/ • n. 1. a common blowfly (Calliphora vomitoria) with a metallic-blue body. 2. the wild cornflower.

bluebottle Black or metallic blue-green fly, slightly larger but similar in habits to the house fly. The larvae (maggots) usually feed on carrion and refuse containing meat. Like the greenbottle, it is often also called a blowfly. Family Calliphoridae.genus Calliphora. Length: 6–11mm (0.23–0.43in).