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[dahy-az-oh-meth-eyn, -ey-zoh-] /daɪˌæz oʊˈmɛθ eɪn, -ˌeɪ zoʊ-/
noun, Chemistry
a yellow, odorless, toxic, explosive gas, CH 2 N 2 , used chiefly as a methylating agent and in organic synthesis.
Origin of diazomethane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for diazomethane
  • Also, no diazomethane was detected during the esterification procedure.
  • diazomethane and its precursor, n-Methyl-n-nitroso-p-toluene sulfonamide, are potent mutagens.
  • Generally of low reactivity but may act as an oxidizing agent: incompatible with diazomethane, aluminum, and phosphorus.
  • Silicic acid is added to the extract to destroy any remaining diazomethane.
British Dictionary definitions for diazomethane


a yellow odourless explosive gas, used as a methylating agent. Formula: CH2:N:N
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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