STP

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STP,

Physics, Slang TermsSee standard temperature and pressure.

STP, [Slang.]

a potent long-acting hallucinogen.

probably after STP, trademark of a motor-oil additive 1965–70

Collins Concise English Dictionary © HarperCollins Publishers::

STP

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

Etymology: (for sense 3) from Latin: Sanctae Theologiae Professor; (for sense 4) humorous reference to the extra power resulting from scientifically treated petroleum

'STP' also found in these entries (note: many are not synonyms or translations):

NTP - standard temperature and pressure

Forum discussions with the word(s) "STP" in the title:

Power output, 6’ 18/2, stp-1, molded female DC plug

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