| Acronym | Definition |
|---|
| SDEF➣Skin Disease Education Foundation |
| SDEF➣Standard Data Exchange Format |
| SDEF➣Scottish Disability Equality Forum (UK) |
| SDEF➣San Dimas Experimental Forest (USDA; California) |
| SDEF➣San Diego Environmental Foundation (California) |
| SDEF➣Scottish Drug Enforcement Forum (UK) |