| diovular twins | Dizygotic twins are siblings who have shared a common uterine environment. They are due to fertilization of two different ova by different sperm. Dizygotic twins are also called fraternal twins. (12 Dec 1998) |
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| dizygotic twins | Dizygotic twins are siblings who have shared a common uterine environment. They are due to fertilization of two different ova by different sperm. Dizygotic twins are also called fraternal twins. (12 Dec 1998) |
| identical twins | Identical twins, twins which are the result of a single zygote (fertilized egg) splitting into two cell masses and becoming two individuals. The twins are genetically identical and are always of the same sex (both males or both females). Compare: dizygotic twins. (09 Oct 1997) |
| incomplete conjoined twins | Conjoined twin's, the two components of which equal one another but are less than entire individuals. Monoamniotic twins, twin's within a common amnion; such twin's are monovular in origin and may be conjoined. (05 Mar 2000) |
| enzygotic twins | Synonym: monozygotic twins. (05 Mar 2000) |
| twins, dizygotic | Two offspring produced in the same pregnancy from separate ova fertilised at the same time. (12 Dec 1998) |
| twins, monozygotic | Two offspring developed from one fertilised ovum. (12 Dec 1998) |
| uniovular twins | Identical twins, twins which are the result of a single zygote (fertilized egg) splitting into two cell masses and becoming two individuals. The twins are genetically identical and are always of the same sex (both males or both females). Compare: dizygotic twins. (09 Oct 1997) |
| fraternal twins | Fraternal twins are siblings who have shared a common uterine environment. They are due to fertilization of two different ova by different sperm. Fraternal twins are also called dizygotic twins. (12 Dec 1998) |