redstart Syllabification: (red·start)Pronunciation: /ˈredˌstärt/Definition of redstart noun 1an American warbler, the male of which is black with either a red belly or orange markings. Genera Setophaga and Myioborus, subfamily Parulinae, family Emberizidae: several species, in particular the American redstart (S. ruticilla) 2a Eurasian and North African songbird related to the chats, having a reddish tail and underparts. Phoenicurus and other genera, subfamily Turdinae, family Muscicapidae: several species, in particular the widespread P. phoenicurus redstart in other Oxford dictionaries Definition of redstart in the British & World English dictionary