quadruplet

Noun	1.	quadruplet - the cardinal number that is the sum of three and one IV, Little Joe, quartet, quatern, 4, four, quaternion, quaternity, tetrad, foursome, quaternary digit, figure - one of the elements that collectively form a system of numbers; "0 and 1 are digits"
	2.	quadruplet - one of four children born at the same time from the same pregnancy quad sib, sibling - a person's brother or sister
	3.	quadruplet - a set of four similar things considered as a unit quartette, quartet set - a group of things of the same kind that belong together and are so used; "a set of books"; "a set of golf clubs"; "a set of teeth"

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