Abbott-Smith Manual Greek Lexicon
πορφύρεος (G4210)
4 πορφύρεος , -α, -ον , contr., -οῦς, -ᾶ, -οῦν ( πορφύρα ), [in LXX for אַרְגָּמָן ;] purple : Jo 19:2 , 5 ; as subst., πορφυροῦν (sc. ἱμάτιον ), Re 17:4 18:6 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain