GRC

ἀλφάριον

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LSJ

τό, Dim. of ἄλφα, plumb-line, level, Theo Sm. in Ptol. p. 228 H.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)

Pape

τό, = ἀλφάδιον, Mathem.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
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