Definition of investigational
1 : of or relating to investigation <investigational activities>
2 : relating to or being a drug or medical procedure that is not approved for general use but is under investigation in clinical trials regarding its safety and efficacy <an investigational new drug>
First Known Use of investigational
Seen and Heard
What made you want to look up investigational? Please tell us where you read or heard it (including the quote, if possible).