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.
Phrases and idioms:
insulating tape an adhesive tape used to cover exposed electrical wires etc.
Derivatives:
insulation n.
Etymology: L insula island + -ATE(3)
Useful english dictionary. 2012.