A dipterous or two-winged insect, esp. of the family Muscidæ.

North American. A very small fly; esp. a biting midge (family Ceratopogonidae). Now rare.

One of the Diptera; a two-winged fly.

Usually with distinguishing word, esp. a plant name: any of a number of small flies whose larvae can be pests of plants, typically producing galls…