phencyclidinePronunciation: /fɛnˈsʌɪklɪdiːn/ (abbreviation: PCP)Definition of phencyclidine noun [mass noun] a synthetic compound derived from piperidine, used as a veterinary anaesthetic and in hallucinogenic drugs such as angel dust. Origin: 1950s: from pheno- + cyclo- + a shortened form of piperidinephencyclidine in other Oxford dictionaries Definition of phencyclidine in the US English dictionary