quadruplet

English Thesaurus

1. a set of four similar things considered as a unit (noun.group)

hypernym	:	set,
definition	:	a group of things of the same kind that belong together and are so used (noun.group)

2. one of four children born at the same time from the same pregnancy (noun.person)

hypernym	:	sib, sibling,
definition	:	a person's brother or sister (noun.person)

3. the cardinal number that is the sum of three and one (noun.quantity)

hypernym	:	digit, figure,
definition	:	one of the elements that collectively form a system of numeration (noun.quantity)