Full Idea
The substance is the form dwelling in the object, and from it the substance that is a composite of the form and of matter is said to be a substance. So concavity is a substance, the composite of which and of nose are snub nose and snubness.
Gist of Idea
The substance is the form dwelling in the object
Source
Aristotle (Metaphysics [c.324 BCE], 1037a29)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.210
A Reaction
So there is simple substance [ousia?] and composite substance. Notice the startling example that concavity is a substance. Think hard about that. Substance, but not as we know it, Jim.