A dielectric and a dielectric ink include a dielectric material. The dielectric material includes ceramide or a ceramide derivative. A capacitor and a transistor may include the dielectric material. A device may include at least one of a capacitor and a transistor that includes the dielectric material. A dielectric that includes ceramide or a ceramide derivative may be configured to provide dielectric performance in a bio field. The effect on a human body by the dielectric may be reduced, based on the dielectric material of the dielectric including ceramide or a ceramide derivative.