poison gas

noun

1. any of various toxic gases, especially those used in chemical warfare to kill or incapacitate on inhalation or contact, as phosgene, chlorine, etc.

poison gas

noun

1. a gaseous substance, such as chlorine, phosgene, or lewisite, used in warfare to kill or harm

Word History and Origins

Origin of poison gas¹

First recorded in 1910–15

Related Words

• mustard gas