Etymology
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azo- 

before vowels az-, word-forming element denoting the presence of nitrogen, used from late 19c. as combining form of azote (1791), the old term for "nitrogen," from Greek a- "not, without" (see a- (3)) + zoion "a living being" (from PIE root *gwei- "to live"). Azote was coined in French by Lavoisier & de Morveau because living things cannot survive in the pure gas.

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