Strong's #5890: `eyphah (pronounced ay-faw')
feminine from 5774; obscurity (as if from covering):--darkness.
Brown-Driver-Briggs Hebrew Lexicon:
‛êyphâh
1) darkness
Part of Speech: noun feminine
Relation: from H5774
Usage:
This word is used 2 times:
Job 10:22: "A land of darkness, as darkness itself; and of the shadow of death, without any order, and where the light"
Amos 4:13: "is his thought, that maketh the morning darkness, and treadeth upon the high places of the earth,"