Source : Webster's Revised Unabridged Dictionary (1913)

Cowberry \Cow"ber`ry\ (-b[e^]r`r[y^]), n.; pl. {Cowberries}
   (-r[i^]z). (Bot.)
   A species of {Vaccinium} ({V. Vitis-id[ae]a}), which bears
   acid red berries which are sometimes used in cookery; --
   locally called {mountain cranberry}.

Source : WordNet®

cowberry
     n 1: low evergreen shrub of high north temperate regions of
          Europe and Asia and America bearing red edible berries
          [syn: {mountain cranberry}, {lingonberry}, {lingenberry},
           {lingberry}, {foxberry}, {Vaccinium vitis-idaea}]
     2: tart red berries similar to American cranberries but smaller
        [syn: {lingonberry}, {mountain cranberry}, {lowbush
        cranberry}]