κοίλασμα
From LSJ
ὃ γὰρ βούλεται, τοῦθ' ἕκαστος καὶ οἴεται → what he wishes to be true, each person also believes to be true | what he wishes, each person also believes
English (LSJ)
ατος, τό,
A hollow, LXX Is.8.14; groove, Apollod.Poliorc.182.7, Ath.Mech.36.6; interior of a lamp, Hero Spir.2.22.
German (Pape)
[Seite 1466] τό, das Ausgehöhlte, die Höhlung, Sp.