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Tenebrific
Tenebrific Ten`e*brif"ic, a. [L. tenebrae darkness + facere to
make.]
Rendering dark or gloomy; tenebrous; gloomy.
It lightens, it brightens, The tenebrific scene.
--Burns.
Where light Lay fitful in a tenebrific time. --R.
Browning.
Meaning of Tenebrific from wikipedia