superfecundation

American  

[soo-per-fee-kuhn-dey-shuhn, -fek-uhn-] / ˌsu pərˌfi kənˈdeɪ ʃən, -ˌfɛk ən- /

noun

1. the fertilization of two or more ova discharged at the same ovulation by successive acts of sexual intercourse.

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superfecundation British  

/ ˌsuːpəˌfiːkənˈdeɪʃən /

noun

1. physiol the fertilization of two or more ova, produced during the same menstrual cycle, by sperm ejaculated during two or more acts of sexual intercourse

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Etymology

Origin of superfecundation

1850–55; super- + fecundation ( def. )

Example Sentences

He explains that heteropaternal superfecundation occurs when a woman gives birth to twins with different biological fathers.

From The Guardian

The occurrence, known as heteropaternal superfecundation, is rare with only a few cases publicly known worldwide.

From BBC

That result is rare—so rare that the condition has the improbable name “superfecundation.”

From Time

Jennifer Wu, an obstetrician-gynecologist at Lenox Hill Hospital in Manhattan, called it a case of superfecundation, a rare phenomenon classically illustrated in medical textbooks with a black baby and a white baby who are twins.

From New York Times

So how does superfecundation with multiple fathers happen at all?

From The Guardian