DER Full Form. Full Meaning of DER Find long form and abbreviation, slang or definition of DER. What does DER mean? What does DER stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.