名詞 quadruplet:

1. the cardinal number that is the sum of three and one
   同義詞：four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, foursome, Little Joe
2. one of four children born at the same time from the same pregnancy
   同義詞：quad
3. a set of four similar things considered as a unit
   同義詞：quartet, quartette, quadruple

quad.ru.plet

n.（名詞）
One of four offspring born in a single birth.
四胞胎之一：一胎出生的四個孩子中的一個
A group or combination of four associated by common properties or behavior.
四個構成的一組：因共同的財產或行為而聯系在一起的四人小組或聯盟