| heterologous 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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| insemination, artificial, heterologous | Human artificial insemination in which the semen used is that of a man other than the woman's husband. (12 Dec 1998) |
| transplantation, heterologous | Transplantation between animals of different species. (12 Dec 1998) |