| MDS | Master of Dental Surgery; maternal deprivation syndrome; medical data screening; medical data system... |
|---|---|
| MSS | Marshall-Smith syndrome; massage; Medical Superintendents' Society; Medicare Statistical System; men... |
| OAS | old age security; oral allergy syndrome; osmotically active substance |
| OLS | oubain-like substance |
| PGS | peristent gross splenomegaly; Pettigrew syndrome; plant growth substance; postsurgical gastroparesis... |