| RR&R | regular rate and rhythm |
|---|---|
| RSA | rabbit serum albumin; regular spiking activity; relative specific activity; relative standard accura... |
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |
| BS | Bachelor of Science; Bachelor of Surgery; Bacillus subtilis; Bartter syndrome; base strap; bedside; ... |
| FS | factor of safety; Fanconi syndrome; Felty syndrome; fibromyalgia syndrome; field stimulation; Fisher... |