ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: Middle English thorn busk, from thorn (I) + bush, busk bush
1. : any of various spiny or thorny shrubs or small trees: as
a. : thorn I 1b
b. : whitethorn 3
c. : any of various shrubby and thorny African or Australian acacias
2. : a low growth of thorny shrubs especially of dry tropical regions (as in southern Africa and parts of Brazil) — compare thorn forest