| MRU | mass radiography unit; minimal reproductive unit |
|---|---|
| MS | Maffuci syndrome; maladjustment score; mandibular series; Marfan syndrome; Marie-Strumpell [syndrome... |
| MVR | massive vitreous reaction; microvitreoretinal; minimal vascular resistance; mitral valve replacement... |
| MCT | Medium Chain Triglyceride |
| ABY | acid bismuth yeast [medium] |