Definition
"Blow fly" (two words) is simply another way to write "blowfly." It is a fly that is known for laying its eggs on dead animals (carrion). They are those metallic-looking flies you sometimes see buzzing around. They play an essential role in nature by helping to decompose organic material. They are also invaluable in forensic science for estimating time of death. So, "blow fly" is just another way to refer to these important, if somewhat gross, insects. Think of them as tiny recyclers of the natural world.