CO

Pronunciation (US):

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IPA (US):

 Dictionary entry overview: What does CO mean? 

• CO (noun)
  The noun CO has 4 senses:

1. an odorless very poisonous gas that is a product of incomplete combustion of carbon

2. a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

3. one who refuses to serve in the armed forces on grounds of conscience

4. a state in west central United States in the Rocky Mountains

  Familiarity information: CO used as a noun is uncommon.

 Dictionary entry details 

• CO (noun)

Sense 1

Meaning:

An odorless very poisonous gas that is a product of incomplete combustion of carbon

Classified under:

Nouns denoting substances

Synonyms:

carbon monoxide; carbon monoxide gas; CO

Hypernyms ("CO" is a kind of...):

monoxide (an oxide containing just one atom of oxygen in the molecule)

Sense 2

Meaning:

A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

Classified under:

Nouns denoting substances

Synonyms:

atomic number 27; Co; cobalt

Hypernyms ("Co" is a kind of...):

metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

Hyponyms (each of the following is a kind of "Co"):

cobalt 60 (a radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy)

Holonyms ("Co" is a substance of...):

cobaltite (a rare silvery-white mineral; important ore of cobalt)

smaltite (a grey mineral consisting of cobalt arsenide and nickel; an important source of cobalt and nickel)

Sense 3

Meaning:

One who refuses to serve in the armed forces on grounds of conscience

Classified under:

Nouns denoting people

Synonyms:

CO; conscientious objector

Hypernyms ("CO" is a kind of...):

contestant; dissenter; dissident; objector; protester (a person who dissents from some established policy)

Sense 4

Meaning:

A state in west central United States in the Rocky Mountains

Classified under:

Nouns denoting spatial position

Synonyms:

Centennial State; CO; Colo.; Colorado

Instance hypernyms:

American state (one of the 50 states of the United States)

Meronyms (parts of "CO"):

Rocky Mountain National Park (a national park in Colorado having mountains and lakes and streams and forests)

South Platte; South Platte River (a tributary of the Platte River)

Mount Sherman; Sherman (a peak in the Rocky Mountains in central Colorado (14,036 feet high))

San Juan Mountains (a mountain range in southwestern Colorado that is part of the Rocky Mountains)

Republican; Republican River (a tributary of the Kansas River that flows from eastern Colorado eastward through Nebraska and Kansas)

Pike's Peak (a mountain peak in the Rockies in central Colorado (14,109 feet high))

North Platte; North Platte River (a river that rises in northern Colorado and flows northward into Wyoming and then eastward and southeastward through Nebraska where it joins the South Platte to form the Platte River)

Colorado Plateau (a large plateau to the south and west of the Rocky Mountains; abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west; the Grand Canyon is carved out of the southwestern corner)

Colorado; Colorado River (an important river in the southwestern United States; rises in the Rocky Mountains of northern Colorado and flows southwest through Utah into Arizona (where it flows through the Grand Canyon) and then southward through the southern tip of Nevada, then forming the border between California and Arizona and finally into Mexico where it empties into the Gulf of California; the main source of water in the southwestern United States)

Arkansas; Arkansas River (a river that rises in the Rocky Mountains in Colorado and flows southeast through Kansas and Oklahoma and through Arkansas to become a tributary of the Mississippi River)

Pueblo (a city in Colorado to the south of Colorado Springs)

capital of Colorado; Denver; Mile-High City (the state capital and largest city of Colorado; located in central Colorado on the South Platte river)

Colorado Springs (a city in east central Colorado on the eastern edge of the Rocky Mountains; popular tourist center and site of the United States Air Force Academy)

Boulder (a town in north central Colorado; Rocky Mountains resort center and university town)

Mesa Verde National Park (a national park in Colorado containing prehistoric cliff dwellings; semiarid landscape)

Holonyms ("CO" is a part of...):

America; the States; U.S.; U.S.A.; United States; United States of America; US; USA (North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776)

 Context examples 

Potent co carcinogens or tumor promotors, they are diacyl glycerol analogs and activate protein kinase C irreversibly.

(Phorbol Ester, NCI Thesaurus)

NR-CO 04 has been suggested to mediate antibody-dependent cellular cytotoxicity (ADCC).

(Monoclonal Antibody NR-CO-04, NCI Thesaurus)

The chemical structure is CC(=C)C1CCC(=CC1)CO.

(Perillyl alcohol, NCI Thesaurus/CRCH)

“Let me see, it means something about coöperation, doesn’t it?”

(The Sea-Wolf, by Jack London)

For my part, I showed ’em into the parlour, not ’cos they was worthy of it, but ’cos I knew right well they would start bashin’ some of my customers, and maybe get my license into trouble if I left ’em in the bar.

(Rodney Stone, by Sir Arthur Conan Doyle)

He noticed my involuntary twitching and grimacing, and smirked: I only ’ope yer don’t ever ’ave to get used to such as that in this life, ’cos you’ve got a bloomin’ soft skin, that you ’ave, more like a lydy’s than any I know of.

(The Sea-Wolf, by Jack London)

Vell, then, ven Bob was put up opposite this great Eytalian man I says ‘Slap ’im in the vind, Bob,’ ’cos I could see vid ’alf an eye that he vas as puffy as a cheesecake; so Bob he goes in, and as he comes the vorriner let ’im ’ave it amazin’ on the conk.

(Rodney Stone, by Sir Arthur Conan Doyle)