Skip to the word

Added 9 October 2026

triangle

/ˈtɹaɪəŋɡəl/ noun

In Latin: triangulum Wiktionary

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about triangle at Wordnik → Where our words come from →

A three-sided polygon.
Something approximating the shape of a triangle.
the coastline of Chile and Argentina and Brazil forms two legs of a triangle
A small northern constellation near Perseus between Andromeda and Aries.

Origin

PIE word *tréyes From Middle English triangle, from Old French triangle, from Latin triangulum, noun use of adjective triangulus (“three-cornered, having three angles”), from trēs (“three”) + angulus (“corner, angle”), equivalent to tri- + -angle.

From Wiktionary, via Kaikki.org (CC BY-SA)

Back to today's word