GRC

ὦνα

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LSJ

ὦναξ, poet. contr. for ὦ ἄνα, ὦ ἄναξ.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)

Pape

ὦναξ, poet. u. ion. zsgzn = ὦ ἄνα, ὦ ἄναξ.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
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