# psi
## English
### Etymology 1

From Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

#### Pronunciation

Greek letter
* enPR: psī, sī, IPA: /psaɪ/, /saɪ/
* Audio (US); “psi” (Greek letter):(file)
* Homophones: xi, sigh, scye, sai, Si (all for the latter pronunciation only)
* Rhymes: -aɪ
Psychic energy
* enPR: sī, IPA: /saɪ/
* Audio (US):(file)
* Homophones: xi, sigh, scye, sai, Si
* Rhymes: -aɪ

#### Noun

psi (countable and uncountable, plural psis)
* (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
* (uncountable, parapsychology, science fiction) A form of psychic energy.
** 1993, Will Self, My Idea of Fun:‘Come, lad,’ he said. ‘We will take tea together and speak of the noumenon, the psi and other more heterogenous phenomena.’
** 1996, Michael F. Stoeber, Hugo Anthony Meynell, Critical Reflections on the Paranormal (page 60)
    When an event is classified as a psi phenomenon, it is claimed that all known channels for the apparent interaction have been eliminated.
** 2005, Michael Ashley, Transformations: The History of the Science Fiction Magazine 1950 to 1970, Liverpool: Liverpool University Press, page 133:It traces the growth of homo gestalt with the uniting of six lovely outcasts of society who have psi powers and come together as a hive mind, thus creating a gestalt super-being.

##### Derived terms

* psi function
* psi particle

##### See also

* (Greek-script letter names) alpha, beta, gamma, delta, epsilon, zeta, eta, theta, iota, kappa, lambda, mu, nu, xi, omicron, pi, rho, sigma, tau, upsilon, phi, chi, psi, omega

### Etymology 2

Initialism of pounds per square inch.

#### Alternative forms

* P.S.I., PSI

#### Symbol

psi
* Pound per square inch (an imperial unit of pressure)
** 2017 December 12, National Transportation Safety Board, “1.3.5 Electrical Generation and Distribution System”, in Marine Accident Report: Sinking of US Cargo Vessel SS El Faro, Atlantic Ocean, Northeast of Acklins and Crooked Island, Bahamas, October 1, 2015‎, archived from the original on 15 May 2022, pages 36–37:Each turbogenerator consisted of a steam turbine, powered by 900 psi of superheated steam, that was coupled by a set of reduction gears to a General Electric marine alternating-current generator operating at 1,800 rpm. Each generator had a capacity of 2,000 kilowatts of three-phase power at 450 volts and 60 hertz. The main 450-volt switchboard was energized by the two turbogenerators. The emergency switchboard, in the emergency generator room, was fed from the main switchboard through an electrical tie.

##### Related terms

* psia

### Anagrams

* IPS, IPs, ISP, Isp, PIs, SIP, SPI, iPS, isp, pis, sip

## Catalan
### Pronunciation

* IPA: (Central, Balearic, Valencia) [ˈpsi]

### Noun

psi f (plural psis)
* Psi; the Greek letter Ψ (lowercase ψ)

## Czech
### Pronunciation

* IPA: [ˈpsɪ]

### Noun

psi
* nominative/vocative plural of pes

## Dutch
### Etymology

From Ancient Greek ψεῖ (pseî).

### Pronunciation

* IPA: /psi/
* Audio:(file)

### Noun

psi m or f (plural psi's, diminutive psi'tje n)
* psi (letter of the Greek alphabet)

### Further reading

* psi on the Dutch Wikipedia.Wikipedia $^{nl}$

## French
### Pronunciation

* IPA: /psi/
* Audio:(file)
* Homophones: psy, psys

### Noun

psi m (plural psi)
* psi (Greek letter)

### Further reading

* “psi”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

### Anagrams

* pis, spi

## Italian
### Pronunciation

* IPA: /ˈpsi/$^*$
* Rhymes: -i
* Hyphenation: psì

### Noun

psi m or f (invariable)
* psi (Greek letter)

### Anagrams

* spi

## Polish
### Etymology 1

Inherited from Proto-Slavic *pьsьjь. By surface analysis, pies +‎ -i.

#### Pronunciation

* IPA: /ˈpɕi/
* (Lesser Poland):
** (Podegrodzie) IPA: /ˈpɕi/
* Audio:(file)
* Rhymes: -i
* Syllabification: psi

#### Adjective

psi (not comparable, no derived adverb)
* (relational) canine, dog
    Synonyms: pieski, (archaic) sobaczy

##### Derived terms

* psia pogoda
* psie pieniądze

##### Related terms

* psocić impf
* psota
* psotnica
* psotnik

### Etymology 2

Learned borrowing from Ancient Greek ψῖ (psî).

#### Pronunciation

* IPA: /ˈpsi/
* Rhymes: -i
* Syllabification: psi

#### Noun

psi n (indeclinable)
* psi (Greek letter Ψ, ψ)

### Etymology 3

Onomatopoeic

#### Pronunciation

* (Masovia):
** (Near Masovian) IPA: /ˈpɕi/

#### Interjection

psi
* (Near Masovian, often repeated) used to call young dogs
    Coordinate term: a cucu

##### Derived terms

* psina
* psinka

### Further reading

* psi in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
* psi in Polish dictionaries at PWN
* Władysław Matlakowski (1891) “psi”, in “Zbiór wyrazów ludowych dawnej ziemi czerskiej”, in Sprawozdania Komisyi Językowej Akademii Umiejętności, volume 4, Krakow: Drukarnia Uniwersytetu Jagiellońskiego, page 372
* Karol Mátyás (1891) “psi”, in “Słowniczek gwary ludu zamieszkującego wschodnio-południową najbliższą okolicę Nowego Sącza”, in Sprawozdania Komisyi Językowej Akademii Umiejętności (in Polish), volume 4, Kraków: Drukarnia Uniwersytetu Jagiellońskiego, page 328

## Portuguese
### Pronunciation

* (Brazil) IPA: /piˈsi/, /ˈpsi/
* (Brazil) IPA: /piˈsi/, /ˈpsi/
** (Southern Brazil) IPA: /ˈpsi/, /piˈsi/
* (Portugal) IPA: /ˈpsi/
* Rhymes: -i
* Hyphenation: psi

### Etymology 1

Derived from Ancient Greek ψεῖ (pseî)

#### Noun

psi m (plural psis)
* (countable) psi (name of the Greek letter Ψ)

### Etymology 2
#### Noun

psi m or f by sense (plural psis)
* (informal) Clipping of psicólogo.

### References

* "psi", in Dicionário Priberam da Língua Portuguesa [em linha], 2008-2024, https://dicionario.priberam.org/psi.

## Romanian
### Etymology

Borrowed from Greek ψι (psi).

### Noun

psi m (plural psi)
* psi

#### Declension
## Slovak
### Pronunciation

* IPA: [psi]

### Noun

psi m anim
* nominative plural of pes

## Spanish
### Pronunciation

* IPA: /ˈsi/ [ˈsi]
* Rhymes: -i
* Syllabification: psi

### Noun

psi f (plural psíes)
* psi; the Greek letter Ψ, ψ

### Further reading

* “psi”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10