monozygotic twin
noun /ˌmɒnəʊzaɪˌɡɒtɪk ˈtwɪn/
  /ˌmɑːnəʊzaɪˌɡɑːtɪk ˈtwɪn/
 (also monozygous twin 
 /ˌmɒnəʊˈzaɪɡəs twɪn/
  /ˌmɑːnəʊˈzaɪɡəs twɪn/
 (), identical twin)- either of two children or animals born from the same mother at the same time who have developed from a single egg. Identical twins are of the same sex and look very similar.单卵性双胞胎之一(性别相同,外貌相似)