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From Ancient Greekτρίδακνον(trídaknon, “large oyster”), traditionally derived by Pliny from Ancient Greekτρι-(tri-, “three”) + δάκνω(dáknō, “bite”). However, Beekes believes that this is a folk etymology, and this would rather be a loanword from an "Oriental" source.
^ Beekes, Robert S. P. (2010) “τρίδακνον”, in Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN, page 1509
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