The meaning of the Acronym MACRO is...

MACRO is

• Monopole Astrophysics and Cosmic Ray Observatory

More Meanings For MACRO:

• Messy And Confusing Repeated Operation
• Monopole Astrophysics and Cosmic Ray Observatory
• Multiline Aggregated and Combined Risk Optimization
• Merge and Correlate Recorded Output (Program)

MACRO is also in:

• Assembly
• Astronomy
• General
• NASA