Co

Multiple Entries:
  Co    CO    Co.    co-    cobalt    com-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
Co

▶symbol the chemical element cobalt.

Concise Oxford English Dictionary © 2008 Oxford University Press:
CO/siːˈəʊ/

▶abbreviation

• 1 Colombia (international vehicle registration).

• 2 Colorado (in official postal use).

• 3 Commanding Officer.

• 4 conscientious objector.

Concise Oxford English Dictionary © 2008 Oxford University Press:
Co./kəʊ/

▶abbreviation

• 1 company.

• 2 county.

Concise Oxford English Dictionary © 2008 Oxford University Press:
co- /kəʊ/

▶prefix

• 1 (forming nouns) joint; mutual; common: co-author.

• 2 (forming adjectives) jointly; mutually: coequal.

• 3 (forming verbs) together with another or others: co-produce.

• 4 Mathematics of the complement of an angle: cosine.

  ■ the complement of: co-latitude.

– origin from L., orig. a form of com-.

Concise Oxford English Dictionary © 2008 Oxford University Press:
cobalt /ˈkəʊbɔːlt, -ɒlt/

▶noun the chemical element of atomic number 27, a hard silvery-white magnetic metal. (Symbol: Co)

– derivatives
cobaltic /kə(ʊ)ˈbɔːltɪk, -ˈbɒlt-/ adjective,
cobaltous /kə(ʊ)ˈbɔːltəs, -ˈbɒlt-/ adjective.

– origin C17: from Ger. Kobalt ‘imp, demon’ (from the belief that cobalt was harmful to the ores with which it occurred).

Concise Oxford English Dictionary © 2008 Oxford University Press:
com- /kɒm/ (also co-, col-, con-, or cor-)

▶prefix with; together; jointly; altogether: combine.

– origin from L. cum ‘with’.