| PLES | parallel-line equal space |
|---|---|
| RRS | retrorectal space; Richards-Rundle syndrome |
| RSTS | retropharyngeal soft tissue space |
| SES | Society of Eye Surgeons; socioeconomic status; spatial emotional stimulus; sphenoethmoidal suture; s... |
| SM | Master of Science; sadomasochism; self-monitoring; silicon microphysiometer; simple mastectomy; skim... |