| rtl | rectal |
|---|---|
| SRU | sample ratio units; side rails up; solitary rectal ulcer; structural repeating unit |
| SRUS | solitary rectal ulcer syndrome |
| TR | recovery time; rectal temperature; repetition time; residual tuberculin; terminal repeat; tetrazoliu... |
| FRT | Fixation Reflex Test; 안과) 시선 고정 반사 테스트 |