| HFO-A | high-frequency oscillatory [ventilation]-active [expiratory phase] |
|---|---|
| L&A | light and accommodation; living and active |
| MBAS | methylene blue active substance |
| NAD | neutrophil actin dysfunction; new antigenic determinant; nicotinamide adenine dinucleotide; nicotini... |
| OAS | old age security; oral allergy syndrome; osmotically active substance |