di ‧ al ‧ y ‧ sis /daɪˈæləsəs, daɪˈælɪsəs/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Greek , 'separation' , from lyein 'to loosen' ]
the process of taking harmful substances out of someone’s blood using a special machine, because their ↑ kidney s do not work properly:
a dialysis machine
on dialysis
He has been on dialysis for the past three years.