quintuplet
1. [ noun ] (mathematics) the cardinal number that is the sum of four and one
Synonyms: 5 five pentad quint cinque fivesome quintet fin Phoebe Little_Phoebe V
Related terms: digit
2. [ noun ] one of five children born at the same time from the same pregnancy
Synonyms: quin quint
Related terms: sibling
Similar spelling:   quintuple
  quintupling