a. [ L. caliginosus; cf. F. caligineux. ] Affected with darkness or dimness; dark; obscure. [ R. ] Blount. [ 1913 Webster ]

The caliginous regions of the air. Hallywell.

-- Ca*lig"i*nous*ly, adv. -- Ca*lig"i*nous*ness, n. [ 1913 Webster ]