phimosis UK /fʌɪˈməʊ.sɪs/US /faɪˈmoʊ.sɪs/ noun1 •A contraction of the foreskin (either as a stage of development or a pathological condition), which prevents it from being retracted.’Twill end in a phimosis, replied Dr. Slop. — 1762 formsphimoses