diabetic /daɪəˈbɛtɪk/adjective 3noun 1forms 3 adjective3 •Having diabetes, especially diabetes mellitus.He turned diabetic in his thirties. •Of or pertaining to diabetes, especially diabetes mellitus. •Suitable for one having diabetes, especially diabetes mellitus.diabetic socks noun1 •A person with diabetes, usually diabetes mellitus. formsdiabetics · more diabetic · most diabetic