σεμίδαλιςsemídalis, sem-id'-al-is; probably of foreign origin; fine wheaten flour:—fine flour.
Thayer's Greek Lexicon
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STRONGS G4585:
σεμίδαλις, accusative σεμίδαλιν, ἡ, the finest wheaten flour: Revelation 18:13. (Hippocrates, Aristophanes, Josephus, others; the Sept. often for כֹּלֶת.)