QUADRUPLET
quartet, quartette, quadruplet, quadruple
(noun) a set of four similar things considered as a unit
quadruplet, quad
(noun) one of four children born at the same time from the same pregnancy
four, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
(noun) the cardinal number that is the sum of three and one
Source: WordNet® 3.1
Etymology
Noun
quadruplet (plural quadruplets)
One of a group of four babies born from the same mother during the same birth.
(music) A tuplet of four notes.
A sequence of four elements.
A cycle for carrying four riders, arranged so that all the riders can assist in the propulsion.
Source: Wiktionary
Quad"ru*plet, n. [From Quadruple.]
1. A collection or combination of four of a kind.
2. pl. Four children born in the same labor.
3. A cycle for carrying four riders, so arranged that all the reders
can assist in the propulsion.
Source: Webster’s Unabridged Dictionary 1913 Edition