psi

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

From Middle English psi, from Latin psī, from Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

It worked by something called psi." — The Ambulance Made Two Trips, Murray Leinster
Psi, he told himself, was behind the whole mess. — Supermind, Randall Garrett
Psi, he told himself, was behind the whole mess. — Occasion ... for Disaster, Randall Garrett

pounds per square inch

Type a word, a sentence, a book title, or a link to an English article. WordNet and the Classics answer.

Try

A library of classics · a vault of words · instant etymology & meaning