He watched her as she took on a form even less substantial than his own.

Prime matter is matter with no substantial form of its own.

Thomists define the soul as the substantial form of living beings.

Not the substantial form, which we know less.

It assumed an almost substantial form, like that of a great black jaguar, and crept inside a low building.

They're viewing them as a substantial form of entertainment that anybody can enjoy.

As Aquinas says, 'a thing's characteristic operations derive from its substantial form'.

So: they say all men have the same substantial form, am I right?

The whole unity comes from the substantial form and the distribution into parts from the matter.

Solitary experience and a strange vision melt the substantial forms of the world.