GRC

ὁρατήρ

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LSJ

ῆρος, ὁ, = ὁρατής, Hsch. s.v. ὀπτήρ.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)

Pape

[ᾱ], ῆρος, ὁ, = ὁρατής, Hesych.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
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