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Standard temperature (273.15K or 0°C) and pressure (1 atmosphere or 105 pascals), used chiefly in measurements of gases.
1. (Elements & Compounds) trademark scientifically treated petroleum: an oil substitute promising renewed power for an internal-combustion engine
2. (General Physics) Also: NTP standard temperature and pressure: standard conditions of 0°C temperature and 101.325 kPa (760 mmHg) pressure
3. (Education) Professor of Sacred Theology
(Recreational Drugs) a synthetic hallucinogenic drug related to mescaline
[Sense 3 from Latin: Sanctae Theologiae Professor]
[Sense 4 from humorous reference to the extra power resulting from scientifically treated petroleum]
a potent long-acting hallucinogen.
[1965–70; probably after STP, trademark of a motor-oil additive]
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|Noun||1.||STP - standard temperature and pressure|
atm, standard atmosphere, standard pressure, atmosphere - a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
standard temperature - exactly zero degrees centigrade