Webster's Revised Unabridged Dictionary · 1913

Insulate

Insulate , transitive verb

[Latin insulatus insulated, from insula island. See Isle, and compare Isolate.]

1.
To make an island of. [Obsolete] — Pennant
2.
To place in a detached situation, or in a state having no communication with surrounding objects; to isolate; to separate.
3.
(Electricity & Thermotics) To prevent the transfer of electricity or heat to or from (bodies) by the interposition of nonconductors.
Collocations (1)
Insulating stool (Electricity) , a stool with legs of glass or some other nonconductor of electricity, used for insulating a person or any object placed upon it.