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The Collaborative International Dictionary
Obnubilation

Obnubilate \Ob*nu"bi*late\, v. t. [L. obnubilatus, p. p. of obnubilare to obscure. See Ob-, and Nubilate.] To cloud; to obscure. [Obs.]
--Burton. -- Ob*nu"bi*la"tion, n. [Obs.]
--Beddoes.

Wiktionary
obnubilation

n. 1 (context medicine English) The clouding of consciousness. 2 The act or operation of making dark or obscure.

Usage examples of "obnubilation".

He slept little, stopping only when the obnubilation of darkness forced him to rein his tired horse to a halt.