†πυῤῥόςpyrrhós, poor-hros'; from G4442; fire-like, i.e. (specially), flame- colored:—red.
Thayer's Greek Lexicon
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STRONGS G4450:
πυρρός, πυρρά, πυρρόν (from πῦρ), from Aeschylus and Herodotus down, having the color of fire, red: Revelation 6:4; Revelation 12:3. The Sept. several times for אָדֹם.