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The Collaborative International Dictionary of English v.0.48:

Caliginous \Ca*lig"i*nous\, 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]