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) ... 
twins that develop from two separate oocytes fertilized at the same time; they may be quite different in physical appearance and even of opposite sexes.
Type: Term Definitions: 1. twins derived from two zygotes. Synonyms: dichorial twins, diovular twins, fraternal twins, heterologous twins
Twins derived from two different eggs. Often called fraternal twins. 
Twins derived from two different eggs. Often called fraternal twins.