/sand"fluy'/ , n. , pl. sandflies .
1. any of several small, bloodsucking, dipterous insects of the family Psychodidae that are vectors of several diseases of humans.
2. any of several other small, bloodsucking, dipterous insects, as one of the family Heleidae or Simuliidae.
[ 1675-85; SAND + FLY 2 ]