Its flowing!!!

The word diabetes was coined by Aretaeus (81–133 CE) of Cappadocia. The word is taken from Greek diabaínein, and literally means “passing through,” or “siphon,” a reference to one of the diabetes major symptoms of excessive urine discharge. The word became diabetes from the English adoption of the medieval Latin, diabetes. In 1675, Thomas Willis added mellitus to the name (Greek mel “honey,” sense ‘honey sweet’} when he noted that a diabetic’s urine and blood has a sweet taste (first noticed by ancient Indians). In 1776, it was confirmed the sweet taste was because of an excess of sugar in the urine and blood.
Willis, in 1670, distinguished between those with a sweet-tasting urine, (diabetes mellitus) and those with polyuria without taste (diabetes insipidus).

Another source - The word “diabetes” derives from the 1st century AD Greek “diabaínein,” meaning “to stand with legs apart,” presumably alluding to the polyuria associated with the condition when left untreated. Subsequently, the word “mellitus,” derived from the Latin word for honey, was added to refer to the sweet taste of the urine of a patient with diabetes.

The ancient Chinese tested for diabetes by observing whether ants were attracted to a person's urine, and called the ailment "sweet urine disease" (糖尿病); medieval European doctors tested for it by tasting the urine themselves, a scene occasionally depicted in Gothic reliefs.