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Medical Definition of Chrysomyia
1. A genus of myiasis-producing fleshflies (family Calliphoridae) with medium-sized metallic-coloured adults; includes the Old World screw worm, Chrysomyia bezziana (sometimes called Cochliomyia bezziana), which is a primary invader, comparable to Cochliomyia hominivorax, the New World screw worm fly, whereas Chrysomyia megacephala is an Old World equivalent to Cochliomyia macellaria, both being secondary or saprophytic invaders. Origin: G. Chrysos, gold, + myia, fly (05 Mar 2000)