| HR | heart rate; hemorrhagic retinopathy; high resolution; higher rate; histamine receptor; hormonal resp... |
|---|---|
| MFR | mean flow rate; mucus flow rate |
| MHR | major histocompatibility region; malignant hyperthermia resistance; maternal heart rate; maximal hea... |
| MMFR | maximum midexpiratory flow rate; maximal midflow rate |
| MMR | mass miniature radiography; masseter muscle rigidity; maternal mortality rate; measles-mumps-rubella... |