bilberry

definition: blue-black berries similar to American blueberries
example:
speech part: noun
synonyms: whortleberry
definition: erect blueberry of western United States having solitary flowers and somewhat sour berries
example:
speech part: noun
synonyms: thin-leaved bilberry
definition: erect European blueberry having solitary flowers and blue-black berries
example:
speech part: noun
synonyms: whortleberry whinberry blaeberry

How bilberry is being used?