WordNet (r) 3.0 (2006):

Fentanyl
    n 1: trade names of a narcotic analgesic that can be inhaled and
         that acts on the central nervous system and may become
         addictive; used as a veterinary anesthetic and with other
         drugs before, during, and after surgery; also used as a
         nonlethal gas to incapacitate people in hostage situations;
         also abused as a recreational drug [syn: Fentanyl,
         Sublimaze]