1: ἀλίσγημα
(Strong's #234 — Noun Neuter — alisgema — al-is'-ghem-ah )

akin to a late verb alisgeo, "to pollute," denotes "a pollution, contamination," Acts 15:20 , "pollutions of idols," i.e., all the contaminating associations connected with idolatry including meats from sacrifices offered to idols.

2—Peter 2:20DEFILEMENT