before a vowel az-
denoting the presence of nitrogen, esp a nitrogen atom in place of a -CH group or an -NH group in place of a -CH 2 groupazathioprine
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Word Origin for aza-
C20: from az (o) - + -a-
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012