Ca·lig'i·nous adjective [ Latin caliginosus ; confer French caligineux .] Affected with darkness or dimness; dark; obscure. [ R.] Blount. « The caliginous regions of the air. Hallywell. » -- Ca*lig'i*nous*ly , adverb ... Found on http://www.encyclo.co.uk/webster/C/9