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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 .

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

double bond

  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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Word History and Origins

Origin of double bond1

First recorded in 1885–90
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