What is the meaning of the Medical abbreviation fir?

Abbreviation NFIRS

National Fire Incident Reporting System

Abbreviation HEADDFIRST

Hemicraniectomy and Durotomy from Massive Hemispheric Infarctions: A Proposed Multicenter, Prospective Randomized Study

Abbreviation FIRST

Flolan International Randomized Survival Trial

Abbreviation FIRM

formal inference-based recursive modeling

Abbreviation FIRDA

frontal, intermittent rhythmic delta activity

Abbreviation FIR

far infrared

Abbreviation BFIRM

binary formal inference-based recessive modeling

Abbreviation AFIRME

antagonist of the fibrinogen receptor after myocardial events

Abbreviation AFFIRM

Atrial Fibrillation Follow-Up Investigation of Rhythm Management

Abbreviations that look like fir