Definition of clinical trial
: a scientifically controlled study of the safety and effectiveness of a therapeutic agent (such as a drug or vaccine) using consenting human subjects
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
More Confusing Words—Quiz
-
- The magician
______
moved the selected card to the top of the deck.

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Spell words. Make bears.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Share clinical trial
Time Traveler for clinical trial
The first known use of clinical trial was in 1946
See more words from the same year