Siloam = "sent"
1) the Pool of Siloam, a fountain of water in Jerusalem, also called Shiloah in Isa 8:6
2) the Tower of Siloam, may have been a tower near or over the Pool of Siloam, which fell down killing 18 men; very likely they were purifying themselves. (Gill)
Part of Speech: noun proper locative
Of Hebrew origin [H7975]; Siloam (that is, Shiloach), a pool of Jerusalem: - Siloam.
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 Σιλωάμ; click on the second column to search for that grammatical form of the root Σιλωάμ; click on the third column to search for that word and grammatical form; click on the total to search for the root Σιλωάμ.