noun
A small Old World warbler, Eurasian blackcap (Sylvia atricapilla), which is mainly grey with a black crown.
(obsolete, UK, US, dialectal) Any of various species of titmouse (of the family Paridae), including the black-capped chickadee (Poecile atricapillus, syn. Parus atricapillus).
(cooking) An apple roasted until black, to be served in a dish of boiled custard.
(Canada, US) The blackcap raspberry (Rubus leucodermis).