PSI


Meaning of PSI in English

I. ˈ(p)sī, ˈpsē noun

( -s )

Etymology: Late Greek, from Greek psei

1. : the 23d letter of the Greek alphabet — symbol Ψ or ψ; see alphabet table

2. : psi phenomena

II. noun

or psi particle

: j/psi particle herein

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.