quadruplet
Noun
Meaning
the cardinal number that is the sum of three and one
one of four children born at the same time from the same pregnancy
a set of four similar things considered as a unit
Source: WordNetSynonyms
quaternary
quad
Little Joe
four
quaternion
quartet
quadruple
tetrad
foursome
quartette
quaternity
iv
quatern
fourthly
quadrant
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