A material that conducts minimum electrical energy, heat, or noise.
any material that will not carry out electrical energy; a dielectric
A substance which doesn't perform, that's, communicate or transfer, temperature, electrical energy, sound, vibration, and/or want, or which transmits them with trouble; an insulator
A substance which doesn't conduct or transfer a specific form of energy (specifically, temperature or electrical energy), or which transmits it with trouble: thus, wool is a non-conductor of temperature; glass and dry wood are non-conductors of electrical energy. See conductor, 6, electricity, as well as heat.
a material including cup or porcelain with minimal electric or thermal conductivity