Sentence:  No sluggish tide congenial to the <WSD>glooms</WSD>; / This, as it frothed by, might have been a bath / For the fiend's glowing hoof - to see the wrath / Of its black eddy bespate with flakes and spumes. 
Meaning of the word marked with <WSD> tags:  A melancholic, depressing or despondent atmosphere.