| Title | Type |
|---|---|
| Macrostomia | Disease |
| Malar Hypoplasia, with or without cleft in zygomatic bone | Symptom |
| Malformed Auricles | Feature |
| Mandible Hypoplasia | Symptom |
| Mandibular Hypoplasia | Feature |
| Micrognathia | Disease |
| Microphthalmia | Disease |
| Microtia | Disease |
| Mouth | Feature |
| Multiple impacted teeth | Symptom |
| Muscular weakness in DMD | Symptom |