http://www.blueletterbible.org/lang/lexicon/Lexicon.cfm?strongs=H2822
Choshek – the dark; literally darkness, night, obscurity; figuratively: misery, destruction, death, ignorance, sorrow, wickedness. This word is used in Genesis 1:2. Refers to Hades in Psalm 88:13; an underground prison in Isaiah 42:7; 47:5; 49:9;