See also: pir, pír, pîr, пір, and пир

English

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Noun

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PIR (plural PIRs)

  1. (countable, aviation, travel) Initialism of property irregularity report: a form to be filled in when baggage is lost by an airline.
  2. (uncountable) Initialism of passive infrared.
  3. (chemistry) Abbreviation of polyisocyanurate.

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