a. [ Gr. &unr_;; &unr_; equal + &unr_; circumference: cf. F. isopérimètre. See Perimeter. ] (Geom.) Having equal perimeters of circumferences; as, isoperimetrical figures or bodies. [ 1913 Webster ]
n. (Geom.) The science of figures having equal perimeters or boundaries. [ 1913 Webster ]