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

Stag Stool Bois De Marais is a triangular bog-wood chair with a spiky moose antler as its back support. —Osman Can Yerebakan, Curbed, 13 Jan. 2025

Although looted previously, archaeologists still found part of a Norse brooch, fragments of a metal dish and a triangular clasp, both from modern-day England or Ireland. —Aspen Pflughoeft, Miami Herald, 2 Jan. 2025

The main part of the residence includes a distinctive triangular section that hovers over the lower floor and is visible as one drives north on Fairfax Avenue. —Mark David, Robb Report, 26 Dec. 2024

Edwards says that regular tea bags are unlikely to make an enjoyable second cup of tea, but pyramid tea bags—larger, triangular bags that allow for more water to pass through the tea—may yield a few good cups of tea. —Kait Hanson, Southern Living, 25 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