(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.
A mechanical device consisting of a metal box with a series of vertical slats through which material is poured and randomly divided into two samples; this process is repeated to obtain a small representative sample of a bulk material.