κοιλασία
From LSJ
δός μοι πᾷ στῶ καὶ τὰν γᾶν κινήσω → give me a place to stand and I will move the earth, give me a place to stand and I'll move the earth, give me the place to stand and I shall move the earth, give me a place to stand and with a lever I will move the whole world, give me a firm spot to stand and I will move the world, give me a lever and a place to stand and I will move the earth, give me a fulcrum and I shall move the world
English (LSJ)
ἡ, in plural, indentations in beams, Hero Bel.104.2.
German (Pape)
[Seite 1466] ἡ, die Höhlung, Hesych.
Greek (Liddell-Scott)
κοιλασία: ἡ, κοίλωμα, κοιλότης, Ἥρων Βελοπ. 137. 13, Ἡσύχ.