Home › Words › R › redbreastredbreastredbreast · noun — any of several unrelated birds that have a red breast.; A European robin, Erithacus rubecula.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom Middle English redbreste, equivalent to red + breast.nounAny of several unrelated birds that have a red breast.; A European robin, Erithacus rubecula.Any of several unrelated birds that have a red breast.; An American robin, Turdus migratorius.Definitions & examples from Wiktionary (CC BY-SA 3.0).