The story
From th(i)en(yl) + -o- + cycl(ohexyl) + -clidine (“muscarinic receptor agonist/antagonist”).
Etymology from Wiktionary, CC BY-SA 4.0.
tenocyclidine
Today it means: A dissociative anaesthetic drug with stimulant and hallucinogenic effects, similar to phencyclidine but more potent. Full definition →