insulation

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insulation

 [in″sŭ-la´shun]
1. the surrounding of a space or body with material designed to prevent the entrance or escape of radiant energy.
2. the material so used.

in·su·la·tion

(in'sŭ-lā'shŭn), Do not confuse this word with insolation and isolation.
1. The act of insulating.
2. The nonconducting substance so used.
3. The state of being insulated.