equilateral

equi·lat·er·al

adj
\ˌē-kwə-ˈla-tə-rəl, ˌe-, -ˈla-trəl\

Definition of EQUILATERAL

1

: having all sides equal <an equilateral triangle> <an equilateral polygon> — see triangle illustration

2

: having all the faces equal <an equilateral polyhedron>

Origin of EQUILATERAL

Late Latin aequilateralis, from Latin aequi- + later-, latus side — more at lateral

First Known Use: 1570

Other Mathematics and Statistics Terms

abscissa, denominator, divisor, exponent, hypotenuse, logarithm, oblique, radii, rhomb