Abbott-Smith Manual Greek Lexicon
σάρδινος (G4555)
1 † σάρδινος , -ου, ὁ = σάρδιον (q.v.), Re 4:3 , Rec.†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain
Strong's G4555 · Greek
σάρδινος
sardinos · sar'-dee-nos
from the same as 4556; sardine (3037 being implied), i.e. a gem, so called