1capitalized: a large widely distributed genus of shrubs (family Ericaceae) including the blueberries and cranberries and distinguished by the 4- to 5-celled ovary and the usually many-seeded baccate fruit — compare oxycoccus
2 plural -s: any plant of the genus Vaccinium
History and Etymology for vaccinium
New Latin, from Latin, blueberry, whortleberry, probably of non-Indo-European origin; akin to the source of Greek hyakinthos hyacinth