Source : Webster's Revised Unabridged Dictionary (1913)

Vaccinium \Vac*cin"i*um\, n. [L., the blueberry, or
   whortleberry.] (Bot.)
   A genus of ericaceous shrubs including the various kinds of
   blueberries and the true cranberries.

Source : WordNet®

Vaccinium
     n : evergreen or deciduous berry-bearing shrubs of northern
         hemisphere: cranberries; blueberries [syn: {genus
         Vaccinium}]