| M+Am | compound myopic astigmatism |
|---|---|
| M+E, | M&E monitoring and evaluation |
| M-A tube | Miller Abbott tube |
| m-AB | m-aminobenzamide |
| M-C | mineralocorticoid |
| M-I | first meiotic metaphase |
| M-II | second meiotic metaphase |
| m-kg | meter-kilogram |
| M-L | Martin-Lewis [medium] |
| M-mode | motion mode |