The Collaborative International Dictionary of English v.0.48:
Crowberry \Crow`ber`ry\ (kr?"b?r`r?), n. (Bot.) A heathlike plant of the genus Empetrum, and its fruit, a black, scarcely edible berry; -- also called crakeberry. [1913 Webster]WordNet (r) 3.0 (2006):
crowberry n 1: a low evergreen shrub with small purple flowers and black berrylike fruit