cos Meaning, Definition & Usage

1. noun ratio of the adjacent side to the hypotenuse of a right-angled triangle
   cosine.
   
2. noun lettuce with long dark-green leaves in a loosely packed elongated head
   romaine; cos lettuce; romaine lettuce.
   
3. noun an odorless very poisonous gas that is a product of incomplete combustion of carbon
   CO; carbon monoxide gas; carbon monoxide.
   
4. noun a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
   atomic number 27; Co; cobalt.
   
5. noun one who refuses to serve in the armed forces on grounds of conscience
   conscientious objector; CO.
   
6. noun a state in west central United States in the Rocky Mountains
   Centennial State; CO; Colorado.
   

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