Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
s.t.p. is a noun meaning "standard temperature and pressure". It carries one recorded sense.
standard temperature and pressure
Definitions, synonyms and semantic relations for s.t.p. come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.