Definition of superfecundation in English:

superfecundation

noun

Medicine Zoology
  • [mass noun] Fertilization of a second ovum during the same oestrus cycle as a result of a second mating, leading to fetuses of the same age but different parentage.

    • ‘The scientific term describing fraternal twins by different fathers is heteropaternal superfecundation.’
    • ‘Obviously, the twins resulting from superfecundation are dizygotic.’
    • ‘A mother has had two non-twin children on the same day, due to a 1,000,000-1 phenomenon, known as superfecundation, where a woman conceives twice in the same month.’
    • ‘The phenomenon, known as superfecundation, usually results in the second baby dying as the older gets better nourished in the womb.’
    • ‘Traditionally, cases of superfecundation have been discovered by the starkly different appearances of twins.’

Pronunciation:

superfecundation

/ˌsuːpəfɛk(ə)nˈdeɪʃ(ə)n//ˌsjuːpəfiːk(ə)nˈdeɪʃ(ə)n/