Abbott-Smith Manual Greek Lexicon
ἄ-βυσσος (G12)
9 ἄ-βυσσος , -ον ( βυσσός = βυθός ), in cl., boundless, bottomless (e.g. ἄ. πέλαγος, ἄ. πλοῦτος Æsch.). [In LXX (for תְּהוֹם , Ge 1:2 , al.; exc. Is 44:27 , Jb 41:22 for צוּלָה , מְצוּלָה , Jb 36:16 for רַחַב ) and] NT, as subst. (MM, VGT , s.v.), ἡ ἄ. (sc. χώρα ), the abyss ; of the sea ( Ge 1:2 ); of the underworld, as the abode of the dead: Ro 10:7 (a paraphrase of De 30:13 LXX); as the abode of demons, Lk 8:31 , Re 9:1 , 2 , 11 , 11:7 , 17:8 , 20:1 , 3 (Cremer, 2).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain