obtenebration

English

Etymology

Latin obtenebrate (“to make dark”).

Noun

obtenebration

1. (obsolete) The act of darkening; darkness.
   • 1631, Francis [Bacon], “(please specify |century=I to X)”, in Sylua Syluarum: Or A Naturall Historie. In Ten Centuries. […], 3rd edition, London: […] William Rawley; [p]rinted by J[ohn] H[aviland] for William Lee […], →OCLC:

     In every megrim or vertigo, there is an obtenebration joined with a semblance of turning round.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “obtenebration”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)