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
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