| SIMA | single internal mammary artery |
|---|---|
| SIR | single isomorphous replacement; specific immune release; standardized incidence ratio; syndrome of i... |
| SLA | left sacroanterior [fetal position] [Lat. sacrolaeva anterior]; single-cell liquid cytotoxic assay; ... |
| SLR | Shwartzman local reaction; single lens reflex; straight leg raising |
| SLS | segment long-spacing; short-leg splint; single limb support; Sjogren-Larsson syndrome; stagnant loop... |