hop: twining perennials having cordate leaves and flowers arranged in conelike spikes; the dried flowers of this plant are used in brewing to add the characteristic bitter taste to beer
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
ballistocardiograph: a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles