Bailly
α, ον, vb. de τρέφω, PLAT. Rsp. 403 c ; au neutre, XÉN. Lac. 9, 5 ; PLAT. Tim. 19 a, etc.
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LSJ
α, ον, (< τρέφω) to be fed, nurtured, metaph, γυμναστικῇ Pl. R. 403c.
θρεπτέον one must feed, keep, Id. Ti. 19a, X. Lac. 9.5. (from Pass.) ἢ ἐργαστέον ἢ ἀπὸ τῶν εἰργασμένων θρεπτέον one must live on what has been earned, Id. Eq. Mag. 8.8.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)