psi

1 of 3

noun (1)

ˈsī  ˈpsī 

: the 23rd letter of the Greek alphabet see Alphabet Table

psi

2 of 3

noun (2)

ˈsī 

: parapsychological psychic phenomena or powers

psi

3 of 3

abbreviation

pounds per square inch

Examples of psi in a Sentence

Recent Examples on the Web

Noun

A day later, the utility announced a boil water advisory for the entire city as pressure fell below the 20 psi threshold that MLGW CEO Doug McGowen said the utility is required to maintain. —Lucas Finton, USA TODAY, 23 Jan. 2024

After some initial troubleshooting, the leak rate grew to approximately 70 psi per minute. —Stephen Clark, Ars Technica, 25 May 2024

The morning of the incident, pressure in the gas pipeline was lowered to 140 psi. —Hayes Gardner, Baltimore Sun, 4 Apr. 2024

Grizzlies are right behind them with a bite force of 1,160 psi. —Matthew Every, Field & Stream, 6 Sep. 2023

Word History

Etymology

Noun (1)

Middle English, from Medieval Latin, from Late Greek, from Greek psei

Noun (2)

probably by shortening & alteration from psychic

First Known Use

Noun (1)

15th century, in the meaning defined above

Noun (2)

1942, in the meaning defined above

Phrases Containing psi

• J/psi particle
• psi particle

Kids Definition

psi

noun

ˈsī

: the 23rd letter of the Greek alphabet

—Ψ or ψ

Medical Definition

psi

1 of 2 adjective

ˈsī 

: relating to, concerned with, or being parapsychological psychic events or powers

psi phenomena

psi

2 of 2 noun

: psi events or phenomena