Definition/Meaning of psi

• English - 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) 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…
• English - Symbol: psi Pound per square inch (an imperial unit of pressure ) 2024 March 23, “Yield Strength of Steel: A Comprehensive Guide”, in Unionfab, archived from the original on 13 Jan 2026: For M2, this is typically around 3250 MPa (471,000 psi ) when tempered at 300°F (149°C).
• English - Anagrams: IPS , IPs , ISP , pis , sip
• English - Etymology: Etymology 1. From Middle English psi , from Latin psī , from Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ). Etymology 2. Initialism of pounds per square inch .
• English - Pronunciation: IPA: /psaɪ/ , /saɪ/ Homophone: xi Homophone: sigh Homophone: scye Homophone: sai Homophone: Si (all for the latter pronunciation only) Rhymes: -aɪ