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: a common fly that lives in or near people's houses
Full Definition of HOUSEFLY
: a cosmopolitan dipteran fly (Musca domestica) that is often about human habitations and may act as a mechanical vector of diseases (as typhoid fever); also: any of various flies of similar appearance or habitat
: a cosmopolitan dipteran fly of the genus Musca (M. domestica) that is often found about human habitations and may act as a mechanical vector of diseases (as typhoid fever); also: any of various flies of similar appearance or habitat
Common dipteran (Musca domestica), accounting for about 90% of all flies in human dwellings. The adult is dull gray with dirty-yellowish areas on the abdomen. Body size ranges from 0.2 to 0.3 in. (5–7 mm), and the conspicuous compound eyes have some 4,000 facets. Because it has sponging or lapping mouthparts, it cannot bite. It is a problem wherever decomposing organic waste and garbage are allowed to accumulate. Its feet may carry millions of microorganisms, some of which cause diseases, including cholera, dysentery, and typhoid. Some insecticides are effective, but houseflies have developed resistance to others.