isosceles

Definition

Having (at least) two sides of equal length, used especially of a triangle or trapezoid.

Etymology

Borrowed from Latin īsoscelēs, from Ancient Greek ἰσοσκελής (isoskelḗs, “equal-legged”), from ἴσος (ísos, “equal”) + σκέλος (skélos, “leg”) + -ής (-ḗs, adjective suffix). See also iso-.

Example Sentences

• "Upon each exterior side draw an Isosceles Triangle of 480 Fathoms."
• "A right double pyramid is isosceles when the extremities of the vertex-edge are at the same distance from the plane of the base."
• "To prepare for the application of his method, Saccheri made use of a figure with which we are already acquainted. This is the isosceles quadrilateral with the two base angles right angles."