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PGR
+/--- Plant growth regulator
+/--- progesterone receptor
/---- Psychogalvanic Reflex
AcroLexic: Dictionary of Acronyms and Abbreviations contains 4 more definitions of “PGR”.
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See also

Acronym Definitions
CMPGRD 2
PGRC 2
PGRS 2
PGRV 2
IPGRI 1
IBPGR 1