- of or relating to diet: a dietary cure.
noun, plural di·e·tar·ies.
- a regulated allowance of food.
- Obsolete. a system or course of diet.
- of or relating to a diet
noun plural -taries
- a regulated diet
- a system of dieting
1610s, from Medieval Latin dietarius, from Latin diaetarius, from diaeta (see diet (n.1)).
- Of or relating to diet.