billhook noun 3verb 1forms 3 noun3 •An agricultural hand tool often with a curved or hooked end to the blade used for pruning or cutting thick, woody plants. •A medieval polearm, fitted to a long handle, sometimes with an L-shaped tine or a spike protruding from the side or the end of the blade for tackling the opponent; a bill. •A part of the knotting mechanism in a reaper-binder or baler (agricultural machinery). verb1 •To use a billhook. formsbillhooked · billhooking · billhooks