superfecundation
noun/ˌsupəɹˌfikənˈdeɪʃən/ · /ˌsupəɹˌfɛkənˈdeɪʃən/
Etymology From super- + fecundation.
1
Usually the fertilisation of two or more ova by sperm from separate acts of sexual intercourse, which can lead to twins with different fathers
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.