[dahy-az-oh-meth-eyn, -ey-zoh-]
noun Chemistry.
a yellow, odorless, toxic, explosive gas, CH 2 N 2 , used chiefly as a methylating agent and in organic synthesis.

diazo- + methane

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World English Dictionary
diazomethane (daɪˌeɪzəʊˈmiːθeɪn)
a yellow odourless explosive gas, used as a methylating agent. Formula: CH2:N:N

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Example sentences
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.
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