Hi Ted,
First, I would want a quote of Aristotle in context to know exactly of whom he is speaking, and most importantly I would also want the original Greek, since the translator's word choice may be very misleading. Incorporeal is a very loaded Latin term.
Aristotle's Metaphysics Book 1, translated, is available for free at a number of sites -- Example 1, Example 2, Example 3. If you skip to Part 8, you'll see the context in which Aristotle courts incorporealism. In speaking of causes, he's endorses incorporeal substance in contrast with the 4 corporeal elements. In essence, he was accusing the Presocratics of equating physis with hyle. More talk of incorporeal stuff is found in Aristotle's On Generation and Corruption. I don't know where to find the original Greek, but even so, I'd don't know Greek (do you?), much less Ancient Greek, and would still be at the mercy of translators.
Not that it's of consequence, but let's talk terms. You noted that the Greek for "body" came from one etymological chain, which includes physis. Physis (now the physical) did not necessarily entail the bodily. Physis comes from the Greek verb for "to bring forth" or "generating," and was used to describe what made things be. The Presocratics conceived of physis as the extended. The Milesians in particular would narrow that by viewing the extended as the bodily. Aristotle, in contrast, rejected the physis as the extended and the bodily, favoring instead physis as being motion of incorporeal substance. (See Physics, Book III.)
Jordan
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