Cleitarchus (), originally from Aegina, was a grammarian and lexicographer active in either the 1st or 2nd century BC. He wrote a seven-book treatise titled "Languages" or "On Languages", in which he presented the peculiarities of various Greek dialects and interpreted a multitude of idiomatic words, as well as words derived from specialized professional glossaries.Drandakis, 1926. p.334

Cleitarchus and his work are mentioned by Athenaeus,Ath. 7.21 Proclus,Hofinger, 1985 Harpocration,Harpocration's Lexicon, Volume I, page 68 and the Byzantine Etymologicum MagnumMega Etymologicon, entry on Bruchos among others.

All the surviving fragments were collected and published in 1842 in Berlin.Drandakis, 1926. p.334

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