1º_ Acronym for the "delta-9-tetrahydrocannabinol", a substance found in the leaves and shoots of the Cannabis sativa plant and is the psychoactive component of marijuana and hashish used as recreational drugs, although it is also a chemical stimulant of the nervous system in medical treatments. See CBD, cannabis, cannabis. 2nd_ 'THC' is the IATA airport code for the city of Zwedru, in Tchien District (Grand Gedeh County, Liberia).