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XO
++/-- Executive Officer
+/--- crystal oscillator
/---- xanthine oxidase
AcroLexic: Dictionary of Acronyms and Abbreviations contains 3 more definitions of “XO”.
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See also

Acronym Definitions
XOR 2
FXO 2
TOXO 2
XOFF 2
XON 2
XOF 2
BXO 2
TCXO 2
XOS 1
UXO 1
VCXO 1
OCXO 1