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Wikipedia definition
1. Etymological dictionaryAn etymological dictionary discusses the etymology of the words listed. Often, large dictionaries, such as the OED and Webster's, will contain some etymological information, without aspiring to focus on etymology. Etymological dictionaries are the product of research in historical linguistics. For a large number of words in any language, the etymology will be uncertain, disputed, or simply unknown.
Read “Etymological dictionary” on English Wikipedia
Read “語源辞典” on Japanese Wikipedia
Read “Etymological dictionary” on DBpedia

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