IPA: /kwɒˈdruːplɪt/
KK: /kwɑːˈdruːplɪt/
A set of four things or people that are related or born at the same time.
The couple was excited to welcome their quadruplet babies into the world.
Quadruplet → It is formed from "quadru-" (from Latin "quattuor", meaning four) and "-plet" (from Latin "plectere", meaning to fold or weave). The word "quadruplet" refers to a set of four offspring born at the same time, thus weaving together four lives.
Think of the prefix 'quadru-' meaning four, and the suffix '-plet' relating to weaving or folding together — that's why a quadruplet is a set of four born together.
No commonly confused words.