The berry of several species of Vaccinium, an ericaceous genus, differing from the American huckleberries in containing numerous minute seeds instead of ten nutlets. The commonest species are Vaccinium Pennsylvanicum and Vaccinium vacillans. Vaccinium corymbosum is the tall blueberry. [1913 Webster]
blueberry, n. (pl. -ies)
1 any of several plants of the genus Vaccinium, cultivated for their edible fruit.
2 the small blue-black fruit of these plants.