pentaptych

[Pref. pent a-, and Gr. ptyche =a fold.] Art: An altar piece consisting of a central por tion, with double folding wings on each side. pěnt-ar-chỹ, s. [Gr. pente five, and arc he = rule, government.] Government by a body of five. "Those five fair bretheren, which I sung of late, For their just number called the pentarchy ." P. Fletcher: Purple Island, vi.