The word 'sterol' is a modern scientific coinage from the early 20th century, designed to describe a specific class of chemical compounds. Its first element, 'ster-', is derived from the Greek 'stereos', meaning 'solid', which references the characteristic rigid, multi-ring molecular framework these substances share. The suffix '-ol' is the standard chemical designation for an alcohol, signifying the presence of a hydroxyl functional group. Thus, the term's literal construction as "solid alcohol" logically reflects the physical property and chemical nature of these biologically crucial molecules, such as cholesterol, which play vital structural roles in cell membranes.

Structure: ster (solid) + ol (chemical suffix) - ster: From Greek stereos, meaning 'solid, firm, three-dimensional'. In this word, it denotes the solid, polycyclic hydrocarbon core structure. - ol: A suffix in International Scientific Vocabulary, from the word 'alcohol', indicating that the substance is an alcohol (a compound containing a hydroxyl group, -OH).