investigational new drug
in·ves·ti·ga·tion·al new drug
noun \in-ˌves-ti-ˈgā-shə-nəl-\Definition of INVESTIGATIONAL NEW DRUG
: a drug that has not been approved for general use by the Food and Drug Administration but is under investigation in clinical trials regarding its safety and efficacy first by clinical investigators and then by practicing physicians using subjects who have given informed consent to participate—abbreviation IND; called also investigational drug
