Dont les côtés sont égaux.
ETYM Latin aequilateralis; aequus equal + latus, lateris, side: cf. French équilatéral.
Having all sides or faces equal.
Of a geometrical figure, having all sides of equal length.
For example, a rhombus is an equilateral parallelogram. An equilateral triangle is also equiangular, which means that all three angles are equal as well.