psi

views updated May 14 2018

psi / (p)sī/ • n. 1. the twenty-third letter of the Greek alphabet (Ψ, ψ), transliterated as ‘ps.’ ∎  (Psi) [followed by Latin genitive] Astron. the twenty-third star in a constellation: Psi Aquarii.2. supposed parapsychological or psychic faculties or phenomena: he turns to anecdotal evidence to prove that psi exists.

Psi

views updated May 23 2018

Psi

Greek letter used in parapsychology to indicate psychic or paranormal phenomena such as extrasensory perception (ESP) or psychokinesis (PK).

PSI

views updated May 09 2018

PSI See PHOTOSYSTEM I.

psi

views updated May 23 2018

psi (or p.s.i.) pounds (or pound-force) per square inch