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PIR
+/--- precision infrared radiometer
+/--- Protein Information Resource
+/--- Public Information Repository
AcroLexic: Dictionary of Acronyms and Abbreviations contains 16 more definitions of “PIR”.
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See also

Acronym Definitions
SPIRIT 4
PIRT 3
SPIRES 2
SPIRE 2
PIRD 2
SPIREP 2
IPIR 2
PIRA 1
EPIR 1
PIRN 1
PIREPS 1
PIRU 1
EPIRB 1
NPIRES 1
PIREP 1
NPIRS 1
PIRS 1
PIRG 1
PIRAZ 1