double bond

noun

, Chemistry.

1. a chemical linkage consisting of two covalent bonds between two atoms of a molecule, represented in chemical formulas by two lines, two dots, or four dots, as CH 2 =CH 2 ; CH 2 :CH 2 ; CH 2 ::CH 2 .

double bond

noun

1. a type of chemical bond consisting of two covalent bonds linking two atoms in a molecule

double bond

/ dŭb′əl /

1. A type of covalent bond in which two electron pairs are shared between two atoms. Each atom contributes two electrons to the bond.
2. See more at covalent bond

Word History and Origins

Origin of double bond¹

First recorded in 1885–90

Example Sentences

Many of these odor molecules also contain carbon-carbon double bonds, which can be broken by ozone.

From Science Daily

A green appearance for comets is not uncommon and is usually the result of breakdown of a reactive molecule called dicarbon - two carbon atoms joined together by a double bond.

From BBC

Meanwhile tiny structural changes—even shifting the location of one double bond—can dramatically alter a scent.

From Scientific American

In recent years investigators have developed photocatalysts that break the resistant double bond between carbon and oxygen in carbon dioxide.

From Scientific American

Each atom might form either a double bond on each side — meaning the adjacent atoms share two electrons — or a triple bond on one side and a single bond on the other.

From Nature