THC

noun
\ ˌtē-(ˌ)āch-ˈsē How to pronounce THC (audio) \

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

First Known Use of THC

1967, in the meaning defined above

History and Etymology for THC

tetrahydrocannabinol

Keep scrolling for more

Learn More about THC

Statistics for THC

Last Updated

27 Jan 2020

Cite this Entry

“THC.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/THC?pronunciation&lang=en_us&dir=t&file=thc00001. Accessed 24 Feb. 2020.

Keep scrolling for more

More Definitions for THC

THC

noun
\ ˌtē-ˌāch-ˈsē How to pronounce THC (audio) \

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 dronabinol
b : 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).

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!