Any of many plants with thorny stems growing in dense clusters, such as many in the Rosa, Rubus, and Smilax genera.
The white heath (Erica arborea), a thorny Mediterranean shrub.
Anything sharp or unpleasant to the feelings.
A pipe for smoking, made from the roots of that shrub.
Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches