χάσμημα
From LSJ
ὅσα ἦν νενοσσευμένα ὀρνίθων γένεα → as many species of birds as had their nests, all the other kinds of birds which had been hatched
English (LSJ)
ατος, τό,
A a wide yawn or gape, Ar.Av.61.
German (Pape)
[Seite 1340] τό, das Gähnende, Aufklaffende, die Oeffnung des weit aufgesperrten Mundes, Ar. Av. 61.