GRC

ὠφελητικός

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LSJ

ή, όν, helpful, useful, Ph. 1.14, Fr. 55 H., Arr. Epict. 2.10.23, Aristid.Quint. 2.9, Dam. Isid. 296.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
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