containing the carbonyl group.
a compound containing metal combined with carbon monoxide, as nickel carbonyl, Ni(CO) 4 .

1865–70; carbon + -yl Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
carbonyl (ˈkɑːbəˌnaɪl, -nɪl)
1.  (modifier) of, consisting of, or containing the divalent group =CO: a carbonyl group or radical
2.  any one of a class of inorganic complexes in which carbonyl groups are bound directly to metal atoms

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

carbonyl car·bon·yl (kär'bə-nĭl')
The bivalent radical CO.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
carbonyl   (kär'bə-nĭl')  Pronunciation Key 
The radical CO, found in a wide range of chemical compounds, especially in aldehydes and ketones.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Nickel carbonyl is a gaseous compound at ordinary pressure or a colorless, highly volatile liquid, with a musty odor.
Carbonyl fluoride hydrolyzes instantly on contact with moisture.
This is because a carbonyl is in tautomeric resonance with an enol.
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