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dou'ble bond'

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 boilerdouble-book
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