OBTENEBRATION
Source: 566, 567
obtenebration. Obtenebration, n. the act of darkening, darkness
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Ob‐ten′e‐bra″tion (?), n. [[L. obtenebrate to make dark.]] The act of darkening; the state of being darkened; darkness. In every megrim or vertigo, there is an obtenebration joined with a semblance of turning round. Bacon.