dietetics

UK: /ˌdaɪɪˈtɛtɪks/

Collins Concise English Dictionary © HarperCollins Publishers::

dietetics / ˌdaɪɪˈtɛtɪks/ noun

1. (functioning as singular) the scientific study and regulation of food intake and preparation

WordReference Random House Learner's Dictionary of American English © 2026

di•e•tet•ic /ˌdaɪɪˈtɛtɪk/   adj. 

Also, ˌdi•e•ˈtet•i•cal. 
1. Nutrition of or relating to diet;
   prepared or suitable for special diets.

n. 

2. Nutrition dietetics, [uncountable* used with a singular verb] the science of nutrition and food preparation.

WordReference Random House Unabridged Dictionary of American English © 2026

di•e•tet•ic  (dī′i tet′ik), adj. 

Also, di′e•tet′i•cal. 
1. Nutrition pertaining to diet or to regulation of the use of food.
2. Nutrition prepared or suitable for special diets, esp. those requiring a restricted sugar intake:
   a jar of dietetic jelly.

n. 

3. Nutrition dietetics, (used with a sing. v.) the science concerned with the nutritional planning and preparation of foods.

• Greek diatētikós, equivalent. to diatē-, variant stem of diaitân to treat, regulate (derivative of díaita diet¹) + -tikos -tic
• Latin diaeteticus
• 1535–45

di′e•tet′i•cal•ly, adv.