Operational Readiness Float
orifice
open reading frame
Owner's Risk of Fire
Office of Research Facilities
Operational Reserve Force
Orbital Reference Frame
IATA code for Norfolk International Ai…
Oberhausen Rotor Furnace
Observer Research Foundation
Oceanic Resource Foundation
Official Representation Fund
Oklahoma Research Foundation
Oman Royal Flight
Ontario Research Foundation
Ontario Research Fund
open read frame
open reading flame
open reading fragment
open reading frames
Operational Readiness Floats
Operations Research and Facilities
Oral Reading Fluency
Ortho Research Foundation
Outbound Route Filtering
Outpatient Rehabilitation Facility
Output Related Funding
Open Reintegration Fund