CO

1. (noun) one who refuses to serve in the armed forces on grounds of conscience
Synonyms: conscientious objector
Related Words: contestant, dissenter, dissident, objector, protester

2. (noun) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
Synonyms: atomic number 27, cobalt
Related Words: cobalt 60, metal, metallic element

3. (noun) a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
Synonyms: carbon dioxide, carbonic acid gas
Related Words: blackdamp, chokedamp, dioxide



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