The term "stem-cell" is a modern scientific compound, first used in the late 19th century. The word "stem" derives from the Old English concept of a tree's main supporting stalk or trunk, which gives rise to branches. This botanical metaphor was adopted into biology to describe undifferentiated cells that serve as the originating source for more specialized cells, much like a trunk gives rise to branches. "Cell" originates from the Latin cella, meaning a small chamber, which was applied in the 17th century by Robert Hooke to describe the microscopic compartments he observed in plant tissue. Thus, "stem-cell" logically combines the idea of a foundational, generative source ("stem") with the basic unit of life ("cell").

Structure: stem (main part) + cell (biological unit) - stem: From Old English stemn, stefn (tree trunk, stalk, root). In this compound, it functions metaphorically to indicate the foundational, generative source. - cell: From Latin cella (small room, storeroom). In biology, it denotes the basic structural and functional unit of living organisms.