Musca \Mus"ca\, n.; pl. Musc[ae]. [L., a fly.]

1. (Zo["o]l.) A genus of dipterous insects, including the common house fly, and numerous allied species.

Note: Formerly, a large part of the Diptera were included under the genus Musca.

2. (Astron.) A small constellation situated between the Southern Cross and the Pole.

Musc[ae] volitantes. [L., flying flies.]

(Med.) Specks or filaments apparently seen moving or glinding about in the field of vision. Their appearance is often a symptom of disease of the eye, or of disorder of the nervous system.

Source: Webster's Revised Unabridged Dictionary (1913)