n.; pl. Bilberries [ Cf. Dan. böllebær bilberry, where bölle is perh. akin to E. ball. ] 1. (Bot.) The European whortleberry (Vaccinium myrtillus); also, its edible bluish black fruit. [ 1913 Webster ]

There pinch the maids as blue as bilberry. Shak. [ 1913 Webster ]

2. (Bot.) Any similar plant or its fruit; esp., in America, the species Vaccinium myrtilloides, Vaccinium cæspitosum and Vaccinium uliginosum. [ 1913 Webster ]