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
Part of Speech: noun feminine
Citing in TDNT: 1:9, 2
From G1 (as a negative particle) and a variation of G1037; depthless, that is, (specifically), (infernal) "abyss": - deep, (bottomless) pit.
|very deep place||1.20|
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἄβυσσος; click on the second column to search for that grammatical form of the root ἄβυσσος; click on the third column to search for that word and grammatical form; click on the total to search for the root ἄβυσσος.