half-mask

noun7

1. •
   A mask covering half the face.
2. •
   A dust mask.
3. •
   A filtering facepiece respirator.
4. •
   An elastomeric respirator.
5. •
   A mask covering the eyes and perhaps the forehead or nose, but not the mouth
6. •
   A half-face diving mask.
7. •
   Synonym of domino mask