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The Collaborative International Dictionary
Dietetical

Dietetic \Di`e*tet"ic\, Dietetical \Di`e*tet"ic*al\, a. [Gr. ?: cf. F. di['e]t['e]tique. See Diet.] Of or performance to diet, or to the rules for regulating the kind and quantity of food to be eaten.

Wiktionary
dietetical

a. (dated form of dietetic English)

WordNet
dietetical

adj. of or relating to the diet; "dietary restrictions" [syn: dietary, dietetic]

Usage examples of "dietetical".

Picnics were conversationally considered in all their more important phases--historical, dietetical, and social.