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ir-1

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  1. variant of in-2 (by assimilation) before r: irradiate.
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ir-2

  1. variant of in-3 (by assimilation) before r: irreducible.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ir-

ir-

prefix
  1. a variant of in- 1, in- 2
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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 ir-

assimilated form of Latin prefixes in- (see in-) before -r-.

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Online Etymology Dictionary, © 2010 Douglas Harper