Blueberry \Blue"berry\, n. [Cf. Blaeberry.]

(Bot.) 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 V. Pennsylvanicum and V. vacillans. V. corymbosum is the tall blueberry.

Source: Webster's Revised Unabridged Dictionary (1913)