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From: Webster's Revised Unabridged Dictionary (1913)

 In·su·late v. t. [imp. & p. p. Insulated p. pr. & vb. n. Insulating ]
 1. To make an island of. [Obs.]
 2. To place in a detached situation, or in a state having no communication with surrounding objects; to isolate; to separate.
 3. Elec. & Thermotics To prevent the transfer of electricity or heat to or from (bodies) by the interposition of nonconductors.
 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.