τῆθος
From LSJ
αἰὲν ἀριστεύειν καὶ ὑπείροχον ἔμμεναι ἄλλων → always strive for excellence and prevail over others (Iliad 6.208, 11.784)
English (LSJ)
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.)
German (Pape)
[Seite 1105] εος, τό, die Auster; τήθεα διφῶν, Il. 16, 147; vgl. Ath. III, 88.