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

Derived forms: gas helmets

Type of: mask

• hiss
• hisself
• hisser
• hissing
• hist
• histaminase
• histamine
• histamine blocker
• histamine headache
• histidine
• histiocyte
• histiocytic leukaemia
• histiocytic leukemia
• histiocytosis
• histo-
• histocompatibility
• histocompatibility complex
• histogenesis
• histogeny
• histogram
• histoincompatibility
• histologic
• histological
• histologically
• histologist