ir-

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

ir-

variant of in-³ (by assimilation) before r: irreducible.

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British Dictionary definitions for ir-

ir-

prefix

a variant of in- 1, in- 2

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-.