1) the breast, the part of the body from the neck to the navel, where the ribs end
2) a breastplate or corset consisting of two parts and protecting the body on both sides from the neck to the middle
Part of Speech: noun masculine
Citing in TDNT: 5:308, 702
Of uncertain affinity; the chest ("thorax"), that is, (by implication) a corslet: - breastplate.
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 θώραξ; click on the second column to search for that grammatical form of the root θώραξ; click on the third column to search for that word and grammatical form; click on the total to search for the root θώραξ.