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OPA
+++-- oropharyngeal airway
++/-- Office of Public Affairs
+/--- oil pollution act
AcroLexic: Dictionary of Acronyms and Abbreviations contains 15 more definitions of “OPA”.
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See also

Acronym Definitions
OPAC 4
OPAL 3
SOPA 3
AOPA 3
COPA 3
MOPA 3
MESOPAC 2
POPA 2
COPARS 2
OPAR 2
ROPA 2
SOPAC 2
NOPAC 2
COPAD 2
IAOPA 2
LOPAIR 1
AUTOPAY 1
LOPA 1
SUBOPAUTH 1
OPARS 1