1) clean, pure
1a1) purified by fire
1a2) in a similitude, like a vine cleansed by pruning and so fitted to bear fruit
1b) in a levitical sense
1b1) clean, the use of which is not forbidden, imparts no uncleanness
1c1) free from corrupt desire, from sin and guilt
1c2) free from every admixture of what is false, sincere genuine
1c3) blameless, innocent
1c4) unstained with the guilt of anything
Part of Speech: adjective
Citing in TDNT: 3:413, 381
Of uncertain affinity; clean (literally or figuratively): - clean, clear, pure.
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 καθαρός; click on the second column to search for that grammatical form of the root καθαρός; click on the third column to search for that word and grammatical form; click on the total to search for the root καθαρός.