κένωμα
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
English (LSJ)
ατος, τό,
A empty space, vacuum, Erasistr. ap. Gell.16.3.8 (in Ion.form κείνωμα), Ph.Bel.57.17 (pl.), Plb.6.31.9, Phld.Sign.36 (pl.), Plu.2.655b (pl.). 2 vacancy, non-existence, Anon.in Prm.in Rh.Mus.47.603. 3 empty vessel, POxy.1292.4 (i A.D.), PAmh.2.48.8 (ii B.C.): pl., ῥοιᾶς κ. empty shells, Asclep. ap. Gal.13.302. II Medic., evacuation, Phld.Lib.p.30 O., Dsc.5.11, Plu.2.381d. 2 evacuant, in pl., Herod.Med.in Rh.Mus.58.89, Ruf.Fr.116.
German (Pape)
[Seite 1419] τό, das Leergemachte, der leere Raum, Zwischenraum, Pol. 6, 31, 9 u. Sp.; – ἰατρικόν, Ausleerung, Reinigung, Plut. de Is. et Osir. 75.