| ras | retrovirus-associated DNA sequence |
|---|---|
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| RSI | rapid-sequence induction; rapid sequence intubation; repetition strain injury |
| rep | let it be repeated [Lat. repetatur]; replication; roentgen equivalent-physical |
| rept | let it be repeated |