WordReference Random House Unabridged Dictionary of American English © 2017
IR ,
  • infrared.
  • Psychologyintelligence ratio.
  • information retrieval.

  • Ir ,
  • ChemistryIrish (def. 4).

  • Ir ,[Symbol, Chem.]
    1. iridium.

    ir-1 ,
  • var. of  in- 2 (by assimilation) before r: irradiate.

  • ir-2 ,
  • var. of  in- 3 (by assimilation) before r: irreducible.

  • Ir. ,
  • Place NamesIreland.
  • Language Varieties, Place NamesIrish.

  • I.R. ,
  • immediate reserve.
  • Militaryinfantry reserve.
  • intelligence ratio.
  • Governmentinternal revenue.

  • WordReference Random House Learner's Dictionary of American English © 2017
    ir-1 ,prefix. 
  • ir- is another form of in-1that is attached to roots beginning with r:ir- + radiate → irradiate.

  • ir-2 ,prefix. 
  • ir- is another form of in-2that is attached to roots beginning with r:ir- + reducible → irreducible.


  • Collins Concise English Dictionary © HarperCollins Publishers::

    Ir the chemical symbol for
    1. iridium



    Ir. abbreviation for
    1. Ireland
    2. Irish



    in-, il-, im-, ir- prefix
    1. not; non-: incredible, insincere, illegal, imperfect, irregular
      Compare un-1
    Etymology: from Latin in-; related to ne-, nōn not
    in-, il-, im-, ir- prefix
    1. in; into; towards; within; on: infiltrate, immigrate
    2. having an intensive or causative function: inflame, imperil
    Etymology: from in (prep, adv)



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



    'Ir' also found in these entries:
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