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diarch

adjective
  1. botany (of a vascular bundle) having two strands of xylem
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Word Origin

C19: from Greek di- 1 + archē beginning, origin
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