From The Collaborative International Dictionary of English v.0.48:

Quadruplet \Quad"ru*plet\, n. [From Quadruple.]
   1. A collection or combination of four of a kind.
      [Webster 1913 Suppl.]

   2. pl. Four children born in the same labor.
      [Webster 1913 Suppl.]

   3. A cycle for carrying four riders, so arranged that all the
      riders can assist in the propulsion.
      [Webster 1913 Suppl.]
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