Definition of STP
: a hallucinogenic drug chemically related to mescaline and amphetamine
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Origin and Etymology of stp
probably from STP, a trademark for a motor fuel additive
Medical Dictionary
noun
\
ˌes-ˌtē-ˈpē
\
medical Definition of STP
: a hallucinogenic drug chemically related to mescaline and amphetamine — called also
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