The Collaborative International Dictionary
Isocephalism
Isocephalism \I`so*ceph"a*lism\, n. [From Gr. ? like-headed. See Iso-, and Cephalon.] (Art) A peculiarity in the design of bas-relief by which the heads of human figures are kept at the same height from the ground, whether the personages are seated, standing, or mounted on horseback; -- called also isokephaleia.
Wiktionary
isocephalism
n. (context arts English) A peculiarity in the design of bas relief by which the heads of human figures are kept at the same height from the ground, whether the characters are seated, standing, or mounted.