noun Download 🔗Share A hallucinogenic and intoxicating compound present in the peyote cactus (Lophophora williamsii), the San Pedro cactus (Echinopsis pachanoi), and the Peruvian torch (Echinopsis peruviana). Examples : "The student experimented with mescaline, a drug derived from the peyote cactus, leading to a very unusual and disturbing experience. " substance compound chemistry medicine plant mind Chat with AIVocabulary GamePractice Reading