From proto- + Ancient Greek ὕλη (húlē, “timber, material”).
protyle (countable and uncountable, plural protyles)
- (physics, chemistry, historical) A hypothetical base substance from which all chemical elements were believed to have been made; subatomic particles.
- 2002, Philip Ball, The Elements: A Very Short Introduction, Oxford 2004, p. 73:
- Dumas wondered whether the fundamental building blocks of atoms might be some smaller division of the hydrogen atom: a half, say, or a quarter. This basic substance became known as ‘protyle’.