truth serum: an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely
intravenous anesthetic: an anesthetic that produces anesthesia when injected into the circulatory system
frustum: a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed