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phenformin

noun
  1. a biguanide administered orally in the treatment of diabetes to lower blood concentrations of glucose; it has been largely superseded by metformin. Formula: C 10 H 15 N 5
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Word Origin

C20: from phen (yl) + form (aldehyde) + -in
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