monozygotic twin
noun/ˌmɒnəʊzaɪˌɡɒtɪk ˈtwɪn/
/ˌmɑːnəʊzaɪˌɡɑːtɪk ˈtwɪn/
(also monozygous twin
/ˌmɒnəʊˈzaɪɡəs twɪn/
/ˌmɑːnəʊˈzaɪɡəs twɪn/
(both specialist), 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）