Robert Boyle didn't specifically use the term "atom" in the modern sense. He was a proponent of the corpuscular theory, which stated that matter is composed of tiny, indivisible particles.

He didn't have the tools to study individual atoms, but he did experiment with corpuscles, which he believed were the fundamental building blocks of matter.

While Boyle didn't name these corpuscles, they are the precursors to our modern understanding of atoms.