v.tr. 1 prevent the passage of electricity, heat, or sound from (a thing, room, etc.) by interposing non-conductors. 2 detach (a person or thing) from its surroundings; isolate. 3 archaic make (land) into an island. insulating tape an adhesive tape used to cover exposed electrical wires etc. insulation n.
[ L insula island + -ATE(3) ]