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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 .
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for double-bond

double bond

noun
1.
a type of chemical bond consisting of two covalent bonds linking two atoms in a molecule
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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double-bond in Medicine

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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double-bond in Science
double bond
  (dŭb'əl)   
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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9
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