0 a twin (= either of two children born to the same mother on the same occasion) who developed from the same egg as its brother or sister and therefore is the same sex and looks the same as him or her:
1 either of two people who came from the same egg, are the same sex, and look extremely similar
Identical twins do not have identical fingerprints.
Identical twins normally share the same amniotic sac and the same placenta.
In the 1980s, studies were carried out on identical twins (born from the same egg) who had grown up with different families.
Scientists study identical twins to learn about personality.
Studies have been done on identical twins that were separated as babies and brought up in different environments.
