triangular

adjective

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

1

a

: of, relating to, or having the form of a triangle

a triangular plot of land

b

: having a triangular base or principal surface

a triangular table

a triangular pyramid

2

a(1)

: of, relating to, or involving three elements

a triangular agreement

(2)

of a military group : based primarily on three units

b

: of or relating to a love triangle

triangularity

(ˌ)trī-ˌaŋ-gyə-ˈler-ə-tē 

-ˈla-rə-tē

noun

triangularly

trī-ˈaŋ-gyə-lər-lē 

adverb

Examples of triangular in a Sentence

Recent Examples on the Web

The basic component of this lattice is a triangular structure. —Paul Sutter, Space.com, 30 Dec. 2024

Each subdial features triangular hands, a nod to previous cult-classic Omega models, in particular the Flightmaster, a 44 mm chronograph introduced in 1969 and marketed as a dedicated pilot’s watch. —Chris Hall, WIRED, 10 Dec. 2024

One of them might have been a triangular crop top showing off my midriff and some hot pants. —Elizabeth Ayoola, Essence, 13 Dec. 2024

The concept of the new Prada boutique showcases a bright facade illuminated by backlight, with a three-dimensional triangular pattern that echoes the brand’s iconic logo. —Lisa Lockwood, WWD, 10 Dec. 2024

Word History

Etymology

Middle English trianguler, from Late Latin triangularis, from Latin triangulum

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing triangular

• triangular number

Kids Definition

triangular

adjective

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

1

: of, relating to, or having the form of a triangle

2

: having a triangular base or principal surface

a triangular pyramid

Medical Definition

triangular

noun

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

: triquetral bone