Triangular
/traɪˈæŋɡjələr/noun
Having the shape of a triangle; three-cornered.
Did you know?“Triangular” ultimately comes from Latin *triangulus*, literally “three-cornered,” built from the same *tri-* root that also gives us words like *triple* and *triangle*.
Etymological Timeline
Proto-Indo-European
PIE
*tréyes
“three”
Latin
Latin
trēs
“three”
Classical Latin
Latin
triangulus
“three-cornered; having three angles”
Middle French
Old French
triangulaire
“triangular”
Late Middle English
English
trianguler
“triangular”
Modern English
English
triangular
“having the shape of a triangle”