| conjoined asymmetrical twins | Conjoined twin's in which one member is nearly normal (host or autosite) and the other (parasite) is small, incomplete, and dependent for its nutrition upon the more nearly normal member. Synonym: conjoined asymmetrical twins. (05 Mar 2000) |
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| conjoined equal twins | Conjoined twin's in which both members are approximately of the same size, and nearly normal except for the areas of fusion. Synonym: conjoined symmetrical twins. (05 Mar 2000) |
| conjoined symmetrical twins | Conjoined twin's in which both members are approximately of the same size, and nearly normal except for the areas of fusion. Synonym: conjoined symmetrical twins. (05 Mar 2000) |
| conjoined unequal twins | Conjoined twin's in which one member is nearly normal (host or autosite) and the other (parasite) is small, incomplete, and dependent for its nutrition upon the more nearly normal member. Synonym: conjoined asymmetrical twins. (05 Mar 2000) |
| polyzygotic twins | Twin's resulting from fertilization of more than two ova discharged in a single ovulating cycle. Siamese twins, originally, a much publicised conjoined pair of twin's (xiphopagus) from Siam in the 19th century; this term has since come into general lay usage for any type of conjoined twin's, but is incorrect. (05 Mar 2000) |
| dichorial 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) |
| 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) |
| 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) |