an ancient writing tablet made up of a hinged pair of wooden or ivory
waxed writing surfaces
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'diptych'LL diptycha, writing tablet of two leaves < Gr, neut. pl. of diptychos, folded < di-, twice + ptychē, a fold < ptyssein, to fold