equilateral

Etymology

equi- + lateral

adj

  1. (geometry, of a polygon) Having all the sides equal.
  2. (geometry, of a polyhedron) Having all the faces equal.
  3. (zoology) Having the two sides equal, as a surface divisible by a longitudinal median line into two halves of the same form.
  4. (zoology) Having all the convolutions of the shell in one plane, chiefly of foraminifers.

noun

  1. A side exactly corresponding, or equal, to others.
  2. A figure having all its sides equal.

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