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 When a person tokes, eats or vapes cannabis, a wave of THC, or tetrahydrocannabinol, washes into the brain. — Laura Sanders THC, the main chemical component of marijuana, has been shown to reduce nausea and increase appetite in chemotherapy patients.— Andrew Weil THC disappears from blood quickly as it is absorbed in the brain, making blood tests a more reliable measure of recent use but not a great correlate of impairment.— Eliza Gray
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
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
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
- More Confusing Words—Quiz
How many of these commonly confused words do you know?
Take the quiz - Name that Thing: Toys and Games Edition
It's all fun and games until someone beats your high score.
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Add Diction
Build a chain of words by adding one letter at a time.
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