double bond

double bond

noun Chemistry.
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 .

Origin:
1885–90

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Collins
World English Dictionary
double bond
 
n
a type of chemical bond consisting of two covalent bonds linking two atoms in a molecule

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

double bond n.
Symbol Δ
A covalent bond in which two electron pairs are shared between two atoms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
double bond   (dŭb'əl)  Pronunciation Key 
A type of covalent bond in which two electron pairs are shared between two atoms. Each atom contributes two electrons to the bond. See more at covalent bond.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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