Webster's English Dictionary

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equilateral

equi.lat.er.al \.e--kw*-'lat-*-r*l, -'la-tr*l\ aj [LL aequilateralis, fr. L 
   aequi- + later-, latus side -m more at LATERAL 1a: having all sides equal 
   {~ triangle}  1b: having all the faces equal {~ polyhedron}  2: bilaterally 
   symmetrical