Definition of "whortleberry"

Any of several shrubs belonging to the genus Vaccinium:

1. Vaccinium myrtillus (bilberry or blue whortleberry);  examples

2. Vaccinium vitis-idaea (lingonberry or red whortleberry);  examples

3. Vaccinium uliginosum (bog whortleberry or bilberry).  examples

A berry of one of these shrubs.  examples