1) a didrachmon or double drachma, a silver coin equal to two Attic drachmas or one Alexandrian, or one half a shekel
Part of Speech: noun neuter
From G1364 and G1406; a double drachma (didrachm): - tribute.
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 δίδραχμον; click on the second column to search for that grammatical form of the root δίδραχμον; click on the third column to search for that word and grammatical form; click on the total to search for the root δίδραχμον.