noun \ˈsī, ˈpsī\

Definition of PSI

:  the 23d letter of the Greek alphabet — see alphabet table

Origin of PSI

Middle English, from Medieval Latin, from Late Greek, from Greek psei
First Known Use: 15th century

Rhymes with PSI


noun \ˈsī\

Definition of PSI

:  parapsychological psychic phenomena or powers

Origin of PSI

probably by shortening & alteration from psychic
First Known Use: 1942



Definition of PSI

pounds per square inch


Next Word in the Dictionary: PSIA
Previous Word in the Dictionary: pshaw
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