Greek didymos, double, twin, twin. Name of the God Apollo as the twin brother of ARTEMIS, sons of Zeus and Leto. Also used DIDYMUS or Didyma not only to refer to the children of Leto, biology also says body structured in two symmetrically situated lobes. In the Gospel of St. John ( 11-16 ) DIDYMUS, refers to shots that some consider the twin brother of Jesus.