The meaning of the Acronym ORR is...

ORR is

• Oxidation- Reduction Reaction

More Meanings For ORR:

• Oxidation- Reduction Reaction
• Operational Readiness Review
• Operations Requirements Review
• Office of Refugee Resettlement
• Oriental Rug Review
• Yorketown, South Australia, Australia
• Osage Railroad

ORR is also in:

• Airport Codes
• Chemistry
• Media
• NASA
• Railroads
• US Government