gasproofing; protection against poison gas
Technical term used in contexts like military defense, industrial safety, or disaster preparedness. Often appears in compounds such as 防毒マスク (gas mask).
Gasproofing measures are essential in chemical plants.
Work while wearing a gas mask.
Compound of 防 (ぼう, 'defend, protect') and 毒 (どく, 'poison'). The reading is on'yomi for both characters.