GRC
Bailly
εος-ους (τὸ) huître, IL.
16, 747.
Étym. pré-grec.
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LSJ
εος, τό, = τήθυον ; sg. τῆθος is used by Ath. in citing Arist. Fr. 304; pl. τήθη Nic. Al. 396, Poll. 6.47; for τήθεα v. τήθυον. (τῆθος was perh. a back-formation (originally Ion.) from τήθεα, τηθέων, which were forms of τήθυον)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
εος, τό, die Auster ; τήθεα διφῶν, Il. 16.147 ; vgl. Ath. III.88.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)