δραχμή, -ῆς, ἡ (< δράσσομαι), [in LXX: in Hex. for in בֶּקַע, שֶׁקֶל Ezra for אֲדַרְכֹּן, דַּרְכְּמוֹן ;] a drachma, nearly equal to the Roman denarius (see: δηνόριον): Luk.15:8-9 (DCG, ii, 200).† (AS)
Thayer:
1) a drachma, a Greek silver coin about the same weight as a Roman denarius
δραχμή
drachmē
drakh-may'
From G1405; a drachma or (silver) coin (as handled)