n.
Pronunciation: ' me-th ə - ˌ d ō n
Variant: also meth · a · don \ - ˌ dän \
Function: noun
Etymology: meth yl + a mino + d iphenyl + -one
Date: 1947
: a synthetic addictive narcotic drug C 21 H 27 NO used especially in the form of its hydrochloride for the relief of pain and as a substitute narcotic in the treatment of heroin addiction