Jupiter or Zeus = "a father of helps"
1) the national god of the Greeks and corresponds to the Roman Jupiter
Part of Speech: noun proper masculine
Of uncertain affinity; in the oblique cases there is used instead of it a (probably cognate) name Δίς Dis deece which is otherwise obsolete; Zeus or Dis (among the Latins Jupiter or Jove), the supreme deity of the Greeks: - Jupiter.
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 Ζεύς; click on the second column to search for that grammatical form of the root Ζεύς; click on the third column to search for that word and grammatical form; click on the total to search for the root Ζεύς.