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superfetation

su·per·fe·ta·tion [ spər fee táysh'n ] (plural su·per·fe·ta·tions)


noun 
Definition:
 
fertilization again after pregnancy: the fertilization of a second ovum after the start of pregnancy, resulting in the presence of two fetuses at different stages of development in the same uterus. It is a regular occurrence in some animal species.

[Early 17th century. Directly or via French< modern Latin superfetation-< superfetare "conceive a second time" < Latin super "over, above" + foetus "offspring"]
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