a potent long-acting hallucinogen.

Origin of STP

First recorded in 1965–70; probably after STP, trademark of a motor-oil additive

Definition for stp (2 of 2) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for stp


abbreviation for

trademark scientifically treated petroleum: an oil substitute promising renewed power for an internal-combustion engine
Also: NTP standard temperature and pressure: standard conditions of 0°C temperature and 101.325 kPa (760 mmHg) pressure
Professor of Sacred Theology


a synthetic hallucinogenic drug related to mescaline

Word Origin for STP

from Latin: Sanctae Theologiae Professor Sense 4 from humorous reference to the extra power resulting from scientifically treated petroleum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for stp

[ ĕs′tē-pē ]


The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.