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