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

The ideal water pressure for a multi-faucet shower system should be between 45-80 psi. —Sophie Flaxman, Better Homes & Gardens, 4 Oct. 2024

An integrated 12-volt electric pump sends water through a 10-ft (3-m) hose and out of that head at a maximum pressure of 50 psi (3.4 bar). —Ben Coxworth, New Atlas, 21 Nov. 2024

This sleek kitty has the strongest bite force of any cat in the world, at 1,500 psi. —Sara Novak, Discover Magazine, 27 Sep. 2024

The water pressure that comes out is 100 psi or around 35 gallons per minute. —Grant Brisbee, The Athletic, 5 Aug. 2024

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