[ἀχλύς] of uncertain derivation; dimness of sight, i.e. (probably) a cataract
Usages throughout the bible
Acts 13:11
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And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist G887 and a darkness; and he went about seeking some to lead him by the hand.