| LI, LII, | LIII first, second, third stage of syphilis |
|---|---|
| LT | heat-labile toxin; laminar tomography; left; left thigh; less than; lethal time; leukotriene; Levin ... |
| S | Greek capital letter sigma; syphilis; summation of series |
| STORCH | syphilis, toxoplasmosis, rubella, cytomegalovirus, and herpesvirus |
| SY | spectroscopy; syphilis, syphilitic |