Definition of STP
:a hallucinogenic drug chemically related to mescaline and amphetamine
What's Trending Now
More Trending Words
From the M-W Editors
Origin and Etymology of stp
probably from STP, a trademark for a motor fuel additive
Medical Dictionary
STP
abbreviation
medical Definition of STP
standard temperature and pressure
Seen and Heard
What made you want to look up STP? Please tell us where you read or heard it (including the quote, if possible).
