<unk>  means nonpassage of urine, in practice is defined as passage of less than 100 milliliters of urine in a day.<unk>  is often caused by failure in the function of kidneys. It may also occur because of some severe obstruction like kidney stones or tumours.  It may occur with end stage renal disease.  It is a more extreme reduction than oliguria, sometimes called anuresis.
Anuria
Crystalluria
Pyuria
Polyuria
Oliguria
Dysuria
Proteinuria
Nocturia