| 1. | S期 | [えす期 ] synthetic phase DNA合成期 |
| 2. | SAR | [えすえーあーる] specific absorption ratio 比吸収率 |
| 3. | SD | [えすでぃ] standard deviation 標準偏差 Stable Disease 不変 |
| 4. | SER | [えすいーあーる] sensitizer enhancement ratio 増感剤効果比 |
| 5. | SI | [えすあい] International System of Units SI単位 |
| 6. | SLD | [えすえるでぃ] sublethal damage 亜致死損傷 |
| 7. | SLDR | [えすえるでぃあーる] sublethal damage recovery 亜致死損傷回復 |
| 8. | SLE | [えすえるいー] 全身性エリテマトーデス 関連: 全身性エリテマトーデス 関連: 全身性紅斑性狼瘡 紅斑性狼瘡 |
| 9. | SMO | [えす・えむ・おー] Site Management Organization 治験施設支援機関 |
| 10. | SMS201-995 | [えすえむえす] Octreotide Acetate |
| 11. | SOBP | [えすおーびーぴー] spread-out Bragg peak 拡大ブラッグピーク |
| 12. | SOP | [えす・おー・ぴー] Standard Operating Procedures 標準業務手順書 |
| 13. | SPECT | [すぺくと] シングルフォトンECT |
| 14. | SR | [えすあーる] synchrotron radiation シンクロトロン放射光 |
| 15. | SRS | [えすあーるえす] stereotactic radiosurgery 定位手術的照射 |
| 16. | SRT | [えす・あーる・てぃ] stereotactic radiotherapy 定位放射線治療 |
| 17. | STI | [えす・てぃ・あい] stereotactic irradiation 定位的放射線照射 |