(n.) A small, bitter, wild European plum, the fruit of the blackthorn (Prunus spinosa); also, the tree itself.

atramentous black black as coal black as ebony black as ink black as midnight black as night coal-black coaly dark dark as night dark as pitch deep black ebony ink-black inky jetty midnight night-black night-dark nigrous pitch-black pitch-dark pitchy raven raven-black sable sloe-black sloe-colored tar-black tarry