| ALA | American Laryngological Association; American Lung Association; aminolevulinic acid; axiolabial |
|---|---|
| ALEC | artificial lung-expanding compound |
| ALI | acute lung injury; annual limit of intake; average lobe index |
| BEL | blood ethanol level; bovine embryonic lung |
| BFL | bird fancier's lung; Borjeson-Forssman-Lehman [syndrome] |