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insulate

in·su·late

insulate

 
pronunciation:
In s leIt
features:
Word History
part of speech: verb
inflections: insulated, insulates, insulating
definition: to cover, line, or surround with a material that reduces or stops the movement of heat, electricity, or sound.
We insulated our house to save money on our heating bill.The wire gave off sparks because it was not properly insulated.
Word History
The word insulate comes from insulare, a Latin word that means "to make something like an island."