amalgam: an alloy of mercury with another metal (usually silver) used by dentists to fill cavities in teeth; except for iron and platinum all metals dissolve in mercury and chemists refer to the resulting mercury mixtures as amalgams
relation: an abstraction belonging to or characteristic of two entities or parts together
wasabi: the thick green root of the wasabi plant that the Japanese use in cooking and that tastes like strong horseradish; in powder or paste form it is often eaten with raw fish