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diet[diet 词源字典]

diet: [13] Diet comes, via Old French diete and Latin diaeta, from Greek díaita ‘mode of life’. This was used by medical writers, such as Hippocrates, in the specific sense ‘prescribed mode of life’, and hence ‘prescribed regimen of food’. It has been speculated that Latin diaeta, presumably in the yet further restricted sense ‘day’s allowance of food’, came to be associated with Latin diēs ‘day’.

This gave rise to medieval Latin diēta ‘day’s journey’, ‘day’s work’, etc, hence ‘day appointed for a meeting’, and thus ‘meeting (of legislators)’. English acquired this word (coming orthographically full circle as diet) in the 15th century, but it is now mainly used for referring to various foreign legislatures.
[diet etymology, diet origin, 英语词源]