sort by Rank | Alpha
| Possible Meanings | Rank |
| Outside Turning Radius | **** |
| Orthopedic Technology Review | **** |
| OCCUPATIONAL THERAPIST REGISTERED | **** |
| Open Trade Regime | **** |
| Of the Texas Rangers | *** |
| Or Old Time Radio | *** |
| Out There Records | *** |
| Oxygen Transfer Rate | *** |
| Ontario Trauma Registry | *** |
| Occupational Therapy Registered | *** |
| Office of the Registrar | *** |
| Office of the Technical Regulator | *** |
| Organisation and Technology Research | *** |
| OSH Technical Reference | *** |
| Office of Trust Records | *** |
| Of the Received | *** |
| Occupational Therapy Robert | *** |
| Out of Tolerance | *** |
| Onset of Thermal Runaway | *** |
| Ohio Trauma Registry | ** |
| oxygen transmission rates | ** |
| Ocular Tilt Reaction | ** |
| Off-Therapy Registry | ** |
| olfactory trap response | ** |
| orthotopic transplant recipients | ** |
| outflow tract ratio | ** |
| ovarian TNF receptor | ** |
| overt testicular relapse | ** |
| oxygen transfer rates | ** |
| Office of Technology Resources | ** |
| oxytocin-oxytocin receptor | ** |
| Oval Track Racing | ** |
| Ordered to Return | ** |
| Oceanic Transition Routes | ** |
| Office of Trust Risk | ** |
| Operational Trouble Report | ** |
| Ozone Transport Regions | ** |
| Office of Trade Relations | ** |
| Office of Testing and Research | ** |
| Officer Training Retreat | ** |
| ORDER TO RETAIN | ** |
| ORDER TO RETURN | ** |
| Over Target Request | ** |
| Outpatient Treatment Reports | ** |
| Oakland Terminal Railroad | ** |
| Occupancy Tenancy Right | ** |
| On Tune Rejection | ** |
| Oftel Technical Requirement | ** |
| Online Teacher Resources | ** |
| Occupational Therapists to Receive | ** |
| Organ Transplant Recipients | ** |
| Oxford Tire Recycling | ** |
| Otway Trail Riders | ** |
| Okanagan Transmission Reinforcement | ** |
| Outpatient Treatment Record | ** |
| Outpatient Treatment Request | ** |
| Order of the Trapezoid | * |
| Oval Track Racer | * |
| Over Target Requirements | * |
| Oakland Terminal Ry | * |
| Occupational Therapy of Rochester | * |
| Occupational Therapy Representative | * |
| Offset Terminal Retention | * |
| One Time Requests | * |
| Operating Time Record | * |
| Operation Tsunami Relief | * |
| Oxford Trust Registrar | * |
| Ozone Transport Rule | * |
| Ozone Transport Rulemaking | * |
| Over Target Requirement | * |
| Offshore Technology Research | * |
| On Track Realty | * |
| Organic Test Reactor | * |
| Office of Training | * |
| Office of Treasury Reinvention | * |
| Office of Trust Responsibilities | * |
| Operate a Tele Robot | * |
| Overbag Test Range | * |