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From The Collaborative International Dictionary of English v.0.48:
Obtenebration \Ob*ten`e*bra"tion\, n. [L. obtenebrate to make dark.] The act of darkening; the state of being darkened; darkness. [Obs.] [1913 Webster] In every megrim or vertigo, there is an obtenebration joined with a semblance of turning round. --Bacon. [1913 Webster]