"quadruplets" in the noun sense
1. four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
2. quadruplet, quad
one of four children born at the same time from the same pregnancy
3. quartet, quartette, quadruplet, quadruple
a set of four similar things considered as a unit
Source: WordNet® (An amazing lexical database of English)
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