To save this word, you'll need to log in.
\ ˌtē-(ˌ)āch-ˈsē 
\
\Definition of THC
: either of two physiologically active isomers C21H30O2 from hemp plant resin especially : one that is the chief intoxicant in marijuana
Keep scrolling for more
Keep scrolling for more
More Definitions for THC
THC
noun\ ˌtē-ˌāch-ˈsē \
\Medical Definition of THC
: either of two physiologically active isomers C21H30O2 that occur naturally in hemp plant resin or are synthetically prepared:
a : one that is the chief intoxicant in marijuana and is used medicinally
— called also delta-9-tetrahydrocannabinol, delta-9-THC
— see dronabinolb : one that is present in marijuana only in minute quantities
Comments on THC
What made you want to look up THC? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Intact Latin Quiz
- What did focus mean in Latin?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- Intact Latin Quiz
What did each of these words mean to ancient Romans?
Take the quiz - The Eponym Quiz
Do you know these words that come from names?
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Dictionary Devil
The dictionary has been scrambled—can you put it back together?
Play the game
Share THC
Time Traveler for THC
The first known use of THC was in 1967
See more words from the same year