quadruplet

[kwo-druhp-lit, -droo-plit, kwod-roo-plit] /kwɒˈdrʌp lɪt, -ˈdru plɪt, ˈkwɒd rʊ plɪt/
noun
1.
any group or combination of four.
2.
quadruplets, four children or offspring born of one pregnancy.
3.
one of four such children or offspring.
4.
Music. a group of four notes of equal value performed in the time normally taken for three.
Origin
1780-90; quadruple + -et (modeled on triplet)
Examples from the web for quadruplet
  • It incorporates formulations for deep water processes of wave generation, dissipation and the quadruplet wave-wave interactions.
British Dictionary definitions for quadruplet

quadruplet

/ˈkwɒdrʊplɪt; kwɒˈdruːplɪt/
noun
1.
one of four offspring born at one birth Often shortened to quad
2.
a group or set of four similar things
3.
(music) a group of four notes to be played in a time value of three
Word Origin and History for quadruplet
n.

"one of four children at a single birth," 1787; from quadruple (adj.) with ending from triplet. Related: Quadruplets. Musical sense is from 1873.

quadruplet in Medicine

quadruplet quad·ru·plet (kwŏ-drŭp'lĭt, -drōō'plĭt, kwŏd'rə-plĭt)
n.

  1. One of four offspring born in a single birth.

  2. A group or combination of four associated by common properties or behavior.