Definition of "bellflower"

Any of many plants that produce flowers that are bell-like.

1. Any flowering plants in the genus Campanula.  examples

2. Flowering plants in the genera, Campanulastrum, Codonopsis, or Platycodon, in the family Campanulaceae.  examples

3. Any flowering plant in genus Uvularia.  examples

A flower of one of these plants, which is shaped like a bell.  examples