(Greek = wood, timber, material)
Aristotle's term for "prime matter", i.e. the first material in the universe.
1. Aristotle's concept arose out of a critique of Anaximander's notion of apeiron.
2. In the Metaphysics, Aristotle proposes a duality between hyle as prime matter and morphe, which forms hyle into the entities that compose the world of our senses