Definitions

1. noun

A hypothetical chemical compound that was once thought to be the fundamental constituent of all matter.

“In the 19th century, the concept of protyle was a central idea in the study of chemistry, but it was later disproven.”

2. noun

A hypothetical elementary substance that was once believed to be the fundamental building block of matter.

“The idea of protyle was influential in the development of modern chemistry, but it has since been abandoned.”