Definition of psi in English:


Syllabification: psi
Pronunciation: /(p)sī


  • 1The twenty-third letter of the Greek alphabet (Ψ, ψ), transliterated as ‘ps.’.
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    • Available in three sizes and able to pump up to a 160 psi max pressure, the pump will be available in September.
    • Variable psi, used within the AHCPR guidelines, can help improve patient comfort.
    • The psi / word association was randomly chosen to be either the first or second of these experiments.
  • 1.1 (Psi) [followed by Latin genitive] Astronomy The twenty-third star in a constellation: Psi Aquarii
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    • In 1672, when Mars was in the vicinity of the three Psi stars of Aquarius, the time was ripe for obtaining the first reliable parallax of Mars.
  • 2Supposed parapsychological or psychic faculties or phenomena: he turns to anecdotal evidence to prove that psi exists
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    • Is psi only a laboratory curiosity, or is it the universal connecting link among all of us?

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
(in science fiction) navigation in outer space