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Use "dietetical" in a sentence
"Picnics were conversationally considered in all their more important phases — historical, dietetical, and social."
"These ultra-temperance dietetical philosophers never flourished greatly."
"Indigent man was I, whose dietetical elegancies had been forgotten, a man with ravenous desires seeking sustenance, not relishes; the means of life, not the means of pampering the carcass; I wanted food."