FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

abussos ἄβυσσος — ab'-us-sos — from 1 (as a negative particle) and a variation of 1037; depthless, i.e. (specially) (infernal) "abyss":--deep, (bottomless) pit.

see GREEK for 1

see GREEK for 1037