TgJ Ez41:6 :לְמִהוֵי רֵישֵי שַריָתָא נָיְחָן עַל זִיזַיָא וְלָא יִהוְיָן שָריָתָא מַעבְרָן בְכוּתלֵי בֵיתָא‏ : that the beams may rest on the cornices so that the beams are not extended into the walls of the building
See the entire entry for zīz, zīzā n.m. cornice