a twin(= either of two children born to the same mother on the same occasion) who do not look exactly the same because they developed from two separate eggs
She had a family history of non-identical twins.
Eva's non-identical twin sister Joy is very different from her.
Synonym: fraternal twin
See also: dizygotic
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Studies of identical and non-identical twins suggest that co-operative behaviour is heritable.
Identical twins, who have the same genes, were more likely to have a similar number of moles and freckles than non-identical twins.
Ellen gave birth to two non-identical twin boys, Brian and Roger.