| 释义 |
functional group
functional groupn. An atom or group of atoms, such as a carboxyl group, in an organic compound that defines the structure of a family of compounds and determines the properties of the family.functional group n (Chemistry) chem the group of atoms in a compound, such as the hydroxyl group in an alcohol, that determines the chemical behaviour of the compound func′tional group`
n. 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. [1935–40] functional groupThe atom (or group of atoms) present in a molecule which determines the characteristic properties of that molecule.Translationsfunctional group
functional group, in organic chemistry, group of atoms within a molecule that is responsible for certain properties of the molecule and reactions in which it takes part. Organic compounds are frequently classified according to the functional group or groups they contain. For example, methanol, ethanol, and isopropanol are all classified as alcohols since each contains a functional hydroxyl group.functional group[¦fəŋk·shən·əl ′grüp] (organic chemistry) An atom or group of atoms, acting as a unit, that has replaced a hydrogen atom in a hydrocarbon molecule and whose presence imparts characteristic properties to this molecule; frequently represented as R‒. Also known as functionality. functional group
func·tion (f), (fŭnk'shŭn), 1. The special action or physiologic property of an organ or other part of the body. 2. To perform its special work or office, said of an organ or other part of the body. 3. The general properties of any substance, depending on its chemical character and relation to other substances, according to which it may be grouped (for example, acids, bases, alcohols, esters). 4. A particular reactive grouping in a molecule, for example, a functional group, such as the -OH group of an alcohol. 5. A quality, trait, or fact that is so related to another as to be dependent on and to vary with this other. 6. A mathematic variable or expression. [L. functio, fr. fungor, pp. functus, to perform] AcronymsSeeFGThesaurusSeefunction |