τῆθος

εος, τό
A. = 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, q.v.)
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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