Definition of buckbrush 

: any of various shrubby North American plants that furnish browse for sheep, deer, and other animals: such as

a : either of two plants of the genus Ceanothus (C. velutinus and C. sanguineus)

b : buttonbush

c : a low much-branched shrub (Purshia tridentata) of the Rocky mountain region

d : a shrub (Cornus femina) of eastern North America with white flowers and fruit

e : buckbush sense 1

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History and Etymology for buckbrush

buck entry 1 + brush

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