| M-mode | motion mode |
|---|---|
| MSS | Marshall-Smith syndrome; massage; Medical Superintendents' Society; Medicare Statistical System; men... |
| MU | megaunit; mescaline unit; methyluric [acid]; Montevideo unit; motion unsharpness; motor unit; mouse ... |
| POM | pain on motion; prescription only medicine |
| PVCM | paradoxical vocal cord motion |