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col-1

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  1. variant of com- before l: collateral.

col-2

  1. variant of colo- before a vowel: colectomy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for col-

col-1

prefix
  1. a variant of com- collateral

col-2

prefix
  1. a variant of colo- colectomy
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

Word Origin and History for col-

form of Latin com- before stems beginning in -l- (see com-).

Online Etymology Dictionary, © 2010 Douglas Harper