Ir- - definition of ir- by The Free Dictionary
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var. of in- 2
(by assimilation) before r: irradiate.
var. of in- 3
(by assimilation) before r: irreducible.
References in classic literature
On the bridge over the canal a dark, ir-
resolute figure seemed to be awaiting something or somebody.
a leading manufacturer of vehicle anti-theft products, today introduced the IR-s Impact Sensor(TM), a new accessory that harnesses the power of infra-red optical technology to yield enhanced performance and fewer false alarms.
The IR-s Impact Sensor features a unique setup using light-reflecting technology that works in a similar fashion to a compact disc player.