a combining form used in the names of chemical compounds in which the peroxy group is present: peroxyborate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
esp for inorganic compounds peroxo-
indicating the presence of the peroxide group, -O–O-peroxysulphuric acid Also (not in technical usage): per-
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