quadruplet
🇺🇸
/kwɑːˈdruːplət/
🇬🇧
/ˈkwɒdrʊplət/
a group of four children born at the same time to the same mother
The quadruplet sisters are all very close and share many interests.
四つ子の姉妹はとても仲が良く、多くの共通の興味を持っています。