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Dictionary

dou'ble bond'

Chem.
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 CH₂=CH₂; CH₂:CH₂; CH₂::CH₂.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

double boiler

double-book

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