| Acronym | Definition |
|---|
| IRAR➣Instituto Regulador de Águas e Resíduos (Portuguese: Institute for the Regulation of Water and Waste) |
| IRAR➣International Registration Authority for Roses |
| IRAR➣Infrared Airborne Radar |
| IRAR➣Immunization Registry Annual Report (US CDC) |
| IRAR➣Interim Remedial Action Report (US Army) |
| IRAR➣Infarct-Related Artery Recanalization (heart attack research) |