From a derivative of G4228 (meaning the ground); level (as easy for the feet): - plain.
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Matrix
Mar 5:4Because that he had been often bound with fettersG3976 and chains, and the chains had been plucked asunder by him, and the fettersG3976 broken in pieces: neither could any man tame him.
Luk 8:29(For he had commanded the unclean spirit to come out of the man. For oftentimes it had caught him: and he was kept bound with chains and in fettersG3976; and he brake the bands, and was driven of the devil into the wilderness.)