| DS | dead air space; dead space; deep sedative; deep sleep; defined substrate; dehydroepiandrosterone sul... |
|---|---|
| ETAR | equivalent tissue air ratio |
| FA | false aneurysm; Families Anonymous; Fanconi anemia; far advanced; fatty acid; febrile antigen; femor... |
| f/cc | fibers per cubic centimeter of air |
| HEPA | high-efficiency particulate air [filter] |