| molfr | mole fraction |
|---|---|
| NF | nafcillin; National Formulary; nephritic factor; neurofibromatosis; neurofilament; neutral fraction;... |
| NMF | N-methylformamide; National Medical Fellowship; National Migraine Foundation; nonmigrating fraction |
| OEF | oil immersion field; oxygen extraction fraction |
| REF | ejection fraction at rest; referred; refused; renal erythropoietic factor |