phi·mo·sis 
(fī-mōsĭs, fĭ-)
(fī-mōsĭs, fĭ-)n. pl. phi·mo·ses (-sēz)
An abnormal constriction of the foreskin that prevents it from being drawn back to uncover the glans penis.
[New Latin phīmōsis, from Greek, a muzzling, phimosis, from phīmoun, to muzzle, from phīmos, muzzle, of unknown origin.]