Definition of bilberry
1
: a low-growing, erect, Eurasian shrub (Vaccinium myrtillus) having blue or bluish-black fruits that resemble blueberries but are borne singly rather than in clusters
2
: the sweet, edible fruit of the bilberry used especially in pies and jams;
also
: the dried fruit or an extract of this fruit used as an herbal remedy
Note:
Both the plant and its fruit are also called whortleberry and (chiefly Scottish) blaeberry.
3
: any of several related plants (such as Vaccinium caespitosum) or their fruit
