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[410b] But is air called ἀήρ because it raises (αἴρει) things from the earth, or because it is always flowing (ἀεὶ ῥεῖ), or because wind arises from its flow? The poets call the winds ἀήτας, “blasts.” Perhaps the poet means to say “air-flow” (ἀητόρρουν), as he might say “wind-flow” (πνευματόρρουν). The word αἴθηρ (ether) I understand in this way: because it always runs and flows about the air (ἀεὶ θεῖ περὶ τὸν ἀέρα ῥέον), it may properly be called ἀειθεήρα. The word γῆ (earth) shows the meaning better


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