co

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun an odorless very poisonous gas that is a product of incomplete combustion of carbon
  2. noun a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  3. noun one who refuses to serve in the armed forces on grounds of conscience

Etymology

Coined by feminist writer Mary Orovan in 1970; in common usage in intentional communities of the Federation of Egalitarian Communities.

In classic literature

Synonyms

carbon monoxide, carbon monoxide gas

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