#0012 ἄβυσσος abussos {ab'-us-sos}

 from G0001 (as a negative particle) and a variation of G1037;
    TDNT - 1:9,2; n f

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) bottomless
 2) unbounded
 3) the abyss
    3a) the pit
    3b) the immeasurable depth
    3c) of Orcus, a very deep gulf or chasm in the lowest parts
        of the earth used as the common receptacle of the dead and
        especially as the abode of demons

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - bottomless pit 5, deep 2, bottomless 2; 9

—Exhaustive Concordance (KJV Translation Frequency & Location)