Strong's G4509 · Greek

ῥύπος

rhupos · hroo'-pos

of uncertain affinity; dirt, i.e. (morally) depravity

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 ῥύπος , -ου, ὁ [in LXX: Is 4:4 ( צֹאָה ), Jb 14:4 ( טָמֵא ), etc. ;] dirt, filth : I Pe 3:21 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain