double bond

American  

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 .

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double bond British  

noun

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

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double bond Scientific  

/ 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

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Etymology

Origin of double bond

First recorded in 1885–90

Compare meaning

How does double-bond compare to similar and commonly confused words? Explore the most common comparisons:

• single bond vs. double bond

Example Sentences

In most molecules, atoms connected by a double bond sit in a flat arrangement.

From Science Daily • Jan. 23, 2026

"Traditionally, carbocations react by eliminating a hydrogen atom adjacent to the carbon atom, forming a carbon-carbon double bond in the product," explains Nuno Maulide.

From Science Daily • May 16, 2024

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 • Jan. 31, 2023

They are a type of polyunsaturated fat and are called omega-3 fatty acids because the third carbon from the end of the fatty acid participates in a double bond.

From Textbooks • Apr. 25, 2013

As for the girl—there was now a double bond between her and the dog.

From A Gentleman Vagabond and Some Others by Smith, Francis Hopkinson