κοίλασμα
From LSJ
ὁ Σιμωνίδης τὴν μὲν ζωγραφίαν ποίησιν σιωπῶσαν προσαγορεύει, τὴν δὲ ποίησιν ζωγραφίαν λαλοῦσαν → Simonides relates that a picture is a silent poem, and a poem a speaking picture | Simonides, however, calls painting inarticulate poetry and poetry articulate painting
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.