κασῆς
Ὥσπερ αὐτοῦ τοῦ ἡλίου μὴ ὄντος καυστικοῦ, ἀλλ' οὔσης ζωτικῆς καὶ ζωοποιοῦ θέρμης ἐν αὐτῷ καὶ ἀπλήκτου, ὁ ἀὴρ παθητικῶς δέχεται τὸ ἀπ' αὐτοῦ ϕῶς καὶ καυστικῶς· οὕτως οὖν ἁρμονίας οὔσης ἐν αὐτοῖς τινὸς καὶ ἑτέρου εἴδους ϕωνῆς ἡμεῖς παθητικῶς ἀκούομεν → Just as although the Sun itself does not cause burning but has a heat in it that is life-giving, life-engendering, and mild, the air receives light from it by being affected and burned, so also although there is a certain harmony and a different kind of voice in them, we hear it by being affected.
English (LSJ)
ὁ (on the accent v. Hdn.Gr.1.63),
A skin used as a saddle or horse-cloth, acc. sg. κασᾶν X.Cyr.8.3.8; acc. dual κασᾶ ib.8.3.7; acc. pl. κασᾶς ib.8.3.6 (καλέσας codd.), Agatharch.20; nom. sg. κασῆς PTeb.38.22 (ii B. C.); abbreviated in PLond.2.402v5 (ii B.C.): written κασσ- by Poll.7.68; cf. κάσσος, κασσοποιός. (Ethiopian word, Agatharch. l. c.; cf. Hebr. kāsāh 'covered'.)
Dutch (Woordenboekgrieks.nl)
κασῆς -οῦ, ὁ, acc. sing. -ᾶν, acc. plur. -ᾶς, acc. dual. -ᾶ, paardendeken.