D defs.my
Entry 1 sense Webster, 1913

Caliginous

/kə-lĭjʹə-nəs/ · Ca·lig·i·nous · IPA /kəˈlɪd͡ʒənəs/
01 a. Affected with darkness or dimness; dark; obscure.
  1. 1.
    Affected with darkness or dimness; dark; obscure.[R.]
    “The caliginous regions of the air.” — Hallywell.