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PPD
++++- purified protein derivative
++/-- Postscript Printer Description
+/--- protein purified derivative
AcroLexic: Dictionary of Acronyms and Abbreviations contains 14 more definitions of “PPD”.
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See also

Acronym Definitions
CPPD 3
SPPD 2
PPDS 2
PPDP 2
PPDD 1
PPDB 1
IPPD 1
DPPDB 1