"murks" in the noun sense
1. fog, fogginess, murk, murkiness
an atmosphere in which visibility is reduced because of a cloud of some substance
"murks" in the verb sense
make dark, dim, or gloomy
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License