dielectric(n = noun.substance) insulator, nonconductor - a material such as glass or porcelain with negligible electrical or thermal conductivity;
is a kind of material, stuff
has particulars: bushing, mineral wool, rock wool, glass wool
dielectric, adj. & n. Electr.
--adj. insulating.
--n. an insulating medium or substance.
Idiom:
dielectric constant permittivity.
Derivative:
dielectrically adv.
Etymology:
DI-(3) + ELECTRIC = through which electricity is transmitted (without conduction)