1. A protective mask with a filter; protects the face and lungs against poisonous gases
   - gasmask, respirator

Derived forms: gas helmets

Type of: mask

• rearing
• rearm
• rearmament
• rearmost
• rearrange
• rearrangement
• rearrest
• rearview mirror
• rearward
• rearwards
• reascend
• reason
• reason out
• reasonable
• reasonable care
• reasonableness
• reasonably
• reasoned
• reasoner
• reasoning
• reasoning backward
• reasoning by elimination
• reasonless
• reassail
• reassemble