G1105
γνόφος
darkness
γνόφος (later form of δν-), [in LXX for אָפֵל, עֲרָפֶל, etc. ;] darkness, gloom (including "an element of tempest," Tr., Syn., §with): Heb.12:18.† SYN.: ἀχλύς, ζόφος, σκότος (Tr., l.with; DB, i, 457a). (AS)
The KJV translates G1105 in the following manner:
blackness (2x)
Full Thayer's lexicon entry
γνόφος — gnóphos
γνόφος, γνόφου, ὁ (for the earlier (and poetic) δνόφος, akin to νέφος (so Alexander Buttmann (1873) Lexil. 2:266; but see Curtius, pp. 704f, 706, cf. 535; Vanicek, p. 1070)), darkness, gloom: Heb 12:18. (Aristotle, de mund. c. 2 at the end, p. 392b, 12; Lucian, de mort. Peregr. 43; Dio Chrysostom; the Sept. also for עָנָן a cloud, Deu 4:11, etc. and for עֲרָפֶל 'thick cloud,' Exo 20:21, etc.; (Trench, § c.).)
1 occurrence