κνῦμα
From LSJ
English (LSJ)
ατος, τό, (κνύω)
A scratching, κ. τῶν δακτύλων, of a person feeling for the door-handle in the dark, Ar.Ec.36, cf. Gal.19.112.
German (Pape)
[Seite 1464] τό, das Kratzen, Reiben, τῶν δακτύλων, das leise Anklopfen an die Thür, Ar. Eccl. 35, Schol. τὸν ἠρεμαῖον κνησμόν.