| MTBF | mean time between (or before) failures |
|---|---|
| MTD | maximum tolerated dose; mean total dose; metastatic trophoblastic disease; Midwife Teacher's Diploma... |
| MTT | malignant teratoma, trophoblastic; maximal treadmill test; meal tolerance test; mean transit time; m... |
| MW | Mallory-Weiss [syndrome]; mean weight; megawatt; microwave; Minot-von Willebrand [syndrome]; molecul... |
| MWP | mean wedge pressure |