Anuric is a medical term used to describe when a patient isn't producing urine. There are various synonyms for this word which may be used interchangeably depending on the medical context. The word "oliguria" is used to describe a reduced urine output. Polyuria refers to an increased production of diluted urine, while "dysuria" refers to painful or difficult urination. Another synonym is "acute renal failure", which is a term used to describe a sudden and severe decline in kidney function which may lead to anuric conditions. Additionally, urinary retention may also be used as a synonym when a patient is unable to pass urine despite the urge to do so.