The American Heritage® Dictionary of the English Language, 4th Edition
n. 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such as ethylamine, C2H5NH2, that may be considered ammonia derivatives in which one or more hydrogen atoms have been replaced by a hydrocarbon radical.
n. A functional group formally derived from ammonia by replacing one, two or three hydrogen atoms with hydrocarbon or other radicals.
n. Any organic compound containing an amine functional group.
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. 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.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals
Word Usage
"Taking up the volatile alkaloids, we find with regard to _conine_, first, that the action of methyl iodide shows it to be a secondary amine, that is, it restrains only one replaceable hydrogen atom of the original ammonia molecule."