Noah Webster's Dictionary (n.) A two-drachma piece; an ancient Greek silver coin, worth nearly forty cents. Int. Standard Bible Encyclopedia DIDRACHMA di-drak'-ma: Two drachmas. See DRACHMA, DRAM.

Multi-Version Concordance Didrachma (1 Occurrence) Matthew 17:24 When they had come to Capernaum, those who collected the didrachma coins came to Peter, and said, "Doesn't your teacher pay the didrachma?" (WEB DBY)