quadruplets
four siblings derived from four fetuses that were fertilized at or about the same time, developed in the uterus simultaneously, and born to the same mother
en-US/ˈkwɑdɹʊplɪts/
en-GB/ˈkwɒdɹuːpləts/
four siblings derived from four fetuses that were fertilized at or about the same time, developed in the uterus simultaneously, and born to the same mother