sort by Rank | Alpha
| Possible Meanings | Rank |
| Research Development Descriptive Summaries | *** |
| respiratory disorder during sleep | ** |
| rheumatic disease data base system | ** |
| Random Digit Dialing Surveys | ** |
| Rate of Decrease of Dielectric Strength | ** |
| Radar Data Distribution Switchboard | ** |
| Rapid Data Delivery System | * |
| Regional Document Delivery System | * |
| Research and Development Descriptive Summary | * |