bil·ber·ry 
(bĭlbĕr′ē)
(bĭlbĕr′ē)n.
1.
a. A low-growing deciduous shrub (Vaccinium myrtillus) of the heath family native to Eurasia and western North America, having edible bluish-black berries borne singly or in pairs, used for making jams, jellies, and juice and for medicinal purposes.
b. Any of several similar plants of the genus Vaccinium.
2. The fruit of any of these plants.
[bil-, probably of Scandinavian origin; see bhel-2 in the Appendix of Indo-European roots + BERRY.]