Abridged from Harpokration s.v. (where 'of the buildings' is part of the gloss, not of the headword).
The entry originated in ancient comment on Aristophanes, Birds 1110 (web address 1); cf. alpha 578.
"Temple-roofs, unlike those of private houses, which were flat, ended in triangular pediments known as aetoi or aetomata, presumably as resembling the shape of an eagle [aetos] with spread wings" (Nan Dunbar, Aristophanes: Birds, edited with introduction and commentary (Oxford 1995) 592).