functional group
noun
a group of atoms responsible for the characteristic behavior of the class of compounds in which the group occurs, as the hydroxyl group in alcohols.
Origin of functional group
First recorded in 1935–40
Words nearby functional group
British Dictionary definitions for functional group
functional group
noun
chem
the group of atoms in a compound, such as the hydroxyl group in an alcohol, that determines the chemical behaviour of the compound
Medical definitions for functional group
functional group
n.
An atom or group of atoms that replaces hydrogen in an organic compound and that defines the structure of a family of compounds and determines the properties of the family.
Scientific definitions for functional group
functional group
An atom or group of atoms that replaces hydrogen in an organic compound. Functional groups define the structure of a family of compounds and determine its properties. The carboxyl and hydroxyl groups are functional groups that define the compounds they are part of as organic acids and alcohols, respectively.