Musca

prop. n. pl. Muscæ (#).
  1. (Zoöl.) A genus of dipterous insects, including the common house fly, and numerous allied species.
  2. (Astron.) A small constellation situated between the Southern Cross and the Pole.
    3. Muscæ volitantes (). (Med.)
    Specks or filaments apparently seen moving or gliding about in the field of vision. Their appearance is often a symptom of disease of the eye, or of disorder of the nervous system.