Asphyxiant

Part of speech: noun, adjective

Definitions

1. A substance that deprives the body of oxygen, resulting in suffocation or respiratory distress through interference with normal breathing functions
2. An agent that can create a dangerous environment by diminishing the availability of breathable air, thereby risking respiratory failure
3. A material that reduces oxygen intake in the body, leading to suffocation or breathing difficulty

Etymology: The root of this word is not about breath. In ancient Greek, "sphyxis" meant the pulse, the throbbing of the blood, and "asphyxia" combined it with the negating prefix "a-" to mean something like "without a pulse." Greek medical writers used the term for a person who seemed to have no pulse, a state that looked like death, so the original focus was on the heartbeat rather than on air. The modern sense developed as physicians came to understand that stopping the pulse and stopping breathing were closely linked. Over time, "asphyxia" came to name suffocation itself, and the suffix "-ant," which marks an agent or substance that causes something, was added to form "asphyxiant" for any substance that produces that effect. The noun and the adjective share the same form, so one word covers both the poison and the condition it produces.

Synonyms: suffocating, smothering