| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
|---|---|
| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
| FTC | Federal Trade Commission; follicular thyroid carcinoma; frequency threshold curve; frequency tuning ... |
| HFO | high-frequency oscillator; high-frequency oscillatory [ventilation] |