δεχήμερος
From LSJ
τούτων γάρ ὄνομα μόνον κοινόν, ὁ δέ κατά τοὔνομα λόγος τῆς οὐσίας ἕτερος → though they have a common name, the definition corresponding with the name differs for each (Aristotle, Categoriae 1a3-4)
English (LSJ)
ον,
A for ten days, lasting ten days, θυσία Pl.Ep.349d; ἐκεχειρία δ. truce terminable at ten days' notice (or, renewable every ten days), Th.5.26; ἀνοχαί Plb.20.9.5; σπονδαὶ Th.6.7,10; written δεκ- BGU812i11 (ii/iii A. D.). II δεχήμερον, τό, a space of ten days, Poll.1.63.
German (Pape)
[Seite 554] zehntägig, Thuc. 5, 26; Plat. u. Folgde; τὸ δεχήμερον, Poll. 1. 63, Zeit von zehn Tagen.