briar

noun

1. 1.Any of many plants with thorny stems growing in dense clusters, such as many in the Rosa, Rubus, and Smilax genera.
2. 2.Anything sharp or unpleasant to the feelings.
3. 3.The white heath, Erica arborea, a thorny Mediterranean shrub.
4. 4.A pipe for smoking, made from the roots of that shrub.