Ob·nu'bi·late transitive verb [ Latin obnubilatus , past participle of obnubilare to obscure. See Ob- , and Nubilate .] To cloud; to obscure. [ Obsolete] Burton. -- Ob*nu'bi*la'tion noun [ Obsolete] Beddoes. Found on http://www.encyclo.co.uk/webster/O/4