dehorn

verb (used with object)

1. to remove the horns of (cattle).
2. to prevent the formation or growth of horns in (cattle), as by cauterization.
3. Horticulture. to prune (a tree, shrub, etc.) by shortening major branches to an extreme degree.

verb (tr)

1. to remove or prevent the growth of the horns of (cattle, sheep, or goats)
2. to cut back (the larger limbs of a tree) drastically