Where does “糖尿病” come from?

糖尿病 (Japanese) comes from Japanese 糖尿, from Japanese 尿, from Japanese 湯, from Old Japanese ゆ, from Proto-Japonic *yu — hot water.

糖尿病 (Japanese): diabetes

Definitions

Step	Language	Word	Meaning
1	Japanese	糖尿	glycosuria
2	Japanese	尿	urine
3	Japanese	湯	warm or hot water; bathwater; a hot spring
4	Old Japanese	ゆ	attaches to the
5	Proto-Japonic	*yu	hot water