1. Any of various bellflowers; especially; harebell
2. Any of various plants bearing blue bell-shaped flowers: as a European herb (Hyacinthoides nonscripta syn. Scilla nonscripta) of the lily family having scapose racemes of drooping bell-shaped flowers — called also wild hyacinth b plural; a glabrous erect eastern United States herb (Mertensia virginica) of the borage family with entire leaves and showy blue flowers pink in the bud — called also Virginia bluebells