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 .

---

double bond British  

noun

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

---

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

---

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 typical alkenes, the carbons adopt a trigonal planar geometry, creating a flat structure around the double bond.

From Science Daily • Jan. 23, 2026

"Products with double bonds -- called alkenes -- can be extremely useful. However, sometimes a single bond instead of a double bond is desired," continues the multiple ERC awardee.

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

For example, an atom with four single bonds, a double bond, and a lone pair has an octahedral electron-group geometry and a square pyramidal molecular structure.

From Textbooks • Feb. 14, 2019

If our supposition be correct, therefore, Ellen and Sylvanus were linked by the double bond of cousinhood and matrimony.

From The Atlantic Monthly, Volume 02, No. 13, November, 1858 by Various