quadruplet
n 1: the cardinal number that is the sum of three and one [syn: {four},
{4}, {IV}, {tetrad}, {quatern}, {quaternion}, {quaternary},
{quaternity}, {quartet}, {foursome}, {Little Joe}]
2: one of four children born at the same time [syn: {quad}]
3: a set of four similar things considered as a unit [syn: {quartet},
{quartette}]