amine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of a group of organic compounds of nitrogen, such as ethylamine, C₂H₅NH₂, that may be considered ammonia derivatives in which one or more hydrogen atoms have been replaced by a hydrocarbon group.

from The Century Dictionary.

• noun A chemical compound produced by the substitution of a basic atom or radical for one or more of the hydrogen atoms of ammonia, as potassamine (NH₂K), ethylamine (C₂H₅NH₂). The amines are all strongly basic in their character. See amide.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Org. Chem.) One of a class of basic substances derived from ammonia by replacement of one or more hydrogen atoms by an alkyl or aryl group. Compare amide, in which an acyl group is attached to the nitrogen. Hydroxylamine and hydrazine, which are not an organic compounds, are also basic and may also be considered amines.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun inorganic chemistry A functional group formally derived from ammonia by replacing one, two or three hydrogen atoms with hydrocarbon or other radicals.
• noun organic chemistry Any organic compound containing an amine functional group.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals