n a person who helps in identifying or preventing or treating illness or disability
n a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen
abbr. 五氯苯酚（pentachlorophenol, 一种迷幻药）；苯环己哌啶（phencyclidine, 等于angel dust, 医用麻醉药）；主控程序（Primary Control Program）