Blackcap \Black"cap`\ (-k[a^]p`), n. 1. (Zool.) (a) A small European song bird ({Sylvia atricapilla}), with a black crown; the mock nightingale. (b) An American titmouse ({Parus atricapillus}); the chickadee. Also called the {black-cap chickadee}. [1913 Webster] 2. (Cookery) An apple roasted till black, to be served in a dish of boiled custard. [1913 Webster] 3. The black raspberry. [1913 Webster]