insulate : Idioms & Phrases
insulating material
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noun a material that reduces or prevents the transmission of heat or sound or electricity
insulation; insulant.
WordNet
Insulating stool
(Elec.) , a stool with legs of glass or some other nonconductor of electricity, used for insulating a person or any object placed upon it.
Webster 1913
insulating tape
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noun a water-resistant adhesive tape used to insulate exposed electrical conductors
friction tape.