1: ἀχλύς
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(Strong's #887 — Noun Feminine — achlus — akh-looce' )

"a mist," especially a dimness of the eyes, is used in Acts 13:11 . "In the single place of its NT use it attests the accuracy in the selection of words, and not least of medical words, which 'the beloved physician' so often displays. For him it expresses the mist of darkness ... which fell on the sorcerer Elymas, being the outward and visible sign of the inward spiritual darkness which would be his portion for a while in punishment for his resistance to the truth" (Trench, Syn., c).

2: ὅμιλος
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(Strong's #3658 — Noun Masculine — homichle — hom'-il-os )

"a mist" (not so thick as nephos and nephele, "a cloud"), occurs in 2—Peter 2:17 (1st part), RV, "mists;" some mss. have nephelai, "clouds" (AV).

3: ζόφος
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(Strong's #2217 — Noun Masculine — zophos — dzof'-os )

is rendered "mist" in the AV of 2—Peter 2:17 (2nd part), RV, "blackness;" "murkiness" would be a suitable rendering. For this and other synonymous terms see BLACKNESS , DARKNESS.