The medical term phimosis has been in use since antiquity, but in contrast to the imprecise definition of the term that is characteristic of nineteenth-century and some controversial modern medical writing. Greek and Roman medical writers imbued it with a clinically precise definition. Using the tools of the history of medicine, an analysis of the medical writings of antiquity reveals that phimosis was defined exclusively as a rare, inflammatory or cicatricial stricture of the preputial orifice consequent to a true pathological condition rather than a disease process in itself. Putative associations between phimosis and diseases such as urinary tract infections or cancer were not made in antiquity and are reflections of modern, geographically isolated social anxieties. The modern European scientific conceptualisation of phimosis, however, represents a return to the precise terminology and conservative therapeutic approach characteristic of Greek and Roman medicine.