THC

noun

ˌtē-(ˌ)āch-ˈsē 

: 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

Examples of THC in a Sentence

Recent Examples on the Web

The mother further told police that a caseworker visited the home because her newborn had tested positive for THC, the chief intoxicant in marijuana. —Sarah Nelson, The Indianapolis Star, 15 Apr. 2024

That month, at a court hearing, Anderson’s probation agent reported Anderson was testing positive for cocaine, THC and alcohol. —Elliot Hughes, Journal Sentinel, 11 Apr. 2024

Jocelyn Stewart, Rosario’s attorney, told NBC San Diego that the corps said the action violated a corps restriction placed on him for allegedly testing positive for THC, the psychoactive ingredient in marijuana. —Bill Feather, NBC News, 11 Apr. 2024

Last year, Davis-Woodhall was stripped of her national indoor title and given a one-month suspension after testing positive for THC, a chemical found in cannabis, marijuana and hashish. —George Ramsay, CNN, 9 Apr. 2024

Studies have shown that THC, one of the main cannabinoids found in cannabis, can significantly reduce rates of anxiety and traumatic memories related to trauma and PTSD by reducing activity in the amygdala and reduces cognitive distractions by inhibiting activity in the prefrontal cortex. —Sarah Sinclair, Forbes, 29 Mar. 2024

One of the licenses connected to Cannabis Business Advisors, Potluck THC LLC, applied to start a marijuana dispensary in Kansas City but was not registered as a business in Missouri, The Star previously reported. —Kacen Bayless, Kansas City Star, 27 Mar. 2024

While many people and their doctors have embraced medical marijuana, treating pets and zoo animals with CBD and THC is just beginning. —Corey Kilgannon, New York Times, 26 Mar. 2024

Other toxicology testing showed a low but detectable level of THC, the active ingredient in marijuana, also was in her system, according to a criminal complaint. —Chris Ramirez, Journal Sentinel, 20 Mar. 2024

Word History

Etymology

tetrahydrocannabinol

First Known Use

1967, in the meaning defined above

Medical Definition

THC

noun

ˌtē-ˌāch-ˈsē 

: 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