bilberry /ˈbɪlb(ə)ɹɪ/ noun2 •Vaccinium myrtillus, the wild European blueberry of the cowberry family.Among the pines grew rowans hung with scarlet berries, and bilberry bushes whose leaves would be fair game for white moth caterpillars in spring. — 2020 •The shrub of the above-mentioned plant. formsbilberries