from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An atom or group of atoms, such as a carboxyl group, that replaces hydrogen in an organic compound and that defines the structure of a family of compounds and determines the properties of the family.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A specific grouping of elements that is characteristic of a class of compounds, and determines some properties and reactions of that class.
- n. A collection of organisms of specific morphological, physiological, behavioral, biochemical properties.
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