Meaning

noun a potent narcotic antagonist (trade name Narcan) especially effective with morphine

originEtymology tree English nal- Proto-Indo-European *wed- Proto-Indo-European *-r̥ Proto-Indo-European *wódr̥ Proto-Hellenic *údōr Ancient Greek ῡ̆̔́δωρ (hū̆́dōr) Ancient Greek ῠ̔δρο- (hŭdro-)der. English hydro- English oxy English (hydr)ox(y) German Ketonbor. English ketone English -one English naloxone From nal- (“opioid receptor antagonist/agonist”) + (hydr)ox(y) + -one.

Etymology from Wiktionary, CC BY-SA 3.0