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STP

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Slang.
  1. a potent long-acting hallucinogen.

Origin of STP

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

STP

  1. standard temperature and pressure.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for stp

STP

abbreviation for
  1. trademark scientifically treated petroleum: an oil substitute promising renewed power for an internal-combustion engine
  2. Also: NTP standard temperature and pressure: standard conditions of 0°C temperature and 101.325 kPa (760 mmHg) pressure
  3. Professor of Sacred Theology
noun
  1. a synthetic hallucinogenic drug related to mescaline

Word Origin

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

stp in Medicine

STP

(ĕs′tē-pē)
n.
  1. DOM