narcotic Definition in the Cambridge English Dictionary
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Definition of “narcotic” - English Dictionary

Definition of "narcotic" - American English Dictionary

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narcoticnoun [C]

 us   /nɑrˈkɑt̬·ɪk/
a ​type of ​drug that ​causessleep and that is used ​medically to ​reduce the ​strength of ​pain, and that in some ​forms is also used ​illegally
narcotic
adjective  us   /nɑrˈkɑt̬·ɪk/
narcotic ​painkillers
(Definition of narcotic from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "narcotic" - British English Dictionary

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narcoticnoun [C]

uk   /nɑːˈkɒt.ɪk/  us   /nɑːrˈkɑːt̬-/
mainly US an ​illegaldrug such as heroin or cocaine : He ​faces three ​years in ​jail for ​selling narcotics. specialized medical a ​drug that makes you ​want to ​sleep and ​prevents you ​feelingpain: Morphine is a narcotic.

narcoticadjective

uk   /nɑːˈkɒt.ɪk/  us   /nɑːrˈkɑːt̬-/
relating to ​drugs that make you ​want to ​sleep and ​preventpain: narcotic ​drugs a narcotic ​effect
(Definition of narcotic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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