v. t.
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 ]
n. [ L. obtentio. See Obtend. ] The act of obtending. [ Obs. ] Johnson. [ 1913 Webster ]