adjective Date: 1905 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

New Collegiate Dictionary. 2001.

Look at other dictionaries:

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  • investigational — in·ves·ti·ga·tion·al …   English syllables

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  • investigational new drug — in·ves·ti·ga·tion·al new drug in .ves ti gā shə nəl n 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… …   Medical dictionary

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