Oxford Dictionary English designer drug nounnoun BrE BrE//dɪˌzaɪnə ˈdrʌɡ// ; NAmE NAmE//dɪˌzaɪnər ˈdrʌɡ// Addiction Add to my wordlistjump to other resultsa drug produced artificially, usually one that is illegal a tablet of the designer drug Ecstasy See related entries: AddictionSee designer drug in the Oxford Advanced American DictionaryCheck pronunciation: designer drug oxfordlearnersdictionaries.com