What is "averruncator"

Averruncator \Av`er*run*ca"tor\, n. An instrument for pruning trees, having two blades, or a blade and a hook, fixed on a long rod and operated by a string or wire; a tree pruner.

n. An instrument for pruning trees, consisting of two blades, or a blade and a hook, fixed on the end of a long rod.

An averruncator is a form of long shears used in arboriculture for averruncating or pruning off the higher branches of trees, etc.