blackcap Syllabification: (black·cap)Pronunciation: /ˈblakˌkap/Definition of blackcap noun 1a mainly European warbler with a black cap in the male and a reddish-brown one in the female. Sylvia atricapilla, family Sylviidae 2North American the black-capped chickadee. See chickadee.blackcap in other Oxford dictionaries Definition of blackcap in the British & World English dictionary