What term did Robert Hooke use to describe the structures he observed in cork?

Robert Hooke used the term "cells" to describe the microscopic structures he observed in cork. In the 17th century, Hooke was one of the first scientists to use a microscope to examine various materials, including cork. Upon observing the small, hollow spaces that resembled tiny rooms or "cells" in a monastery, he coined the term to refer to these structures. This choice reflects a significant moment in biological history, as it marked the beginning of cell theory, which is foundational to our understanding of all living organisms. Hooke's observations laid the groundwork for further exploration into the microscopic world and the later development of cell biology.