Definition of


  1. (noun, quantity) standard temperature and pressure

via WordNet, Princeton University

Synonyms of S.t.p.


Origin of the word S.t.p.

  1. commercial motor oil additive, probably an acronym of scientifically treated petroleum. As the street name of a type of psychedelic drug, attested from 1967. more

via Online Etymology Dictionary, ©2001 Douglas Harper

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