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biguanide

noun
  1. any of a class of compounds some of which are used in the treatment of certain forms of diabetesSee also phenformin
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Word Origin

C19: from bi- 1 + guanidine + -ide
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