Etymology
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insulator (n.)

1801, agent noun in Latin form from insulate (v.). In reference to the glass or earthenware devices to hold telegraph (later telephone) wires, from 1840s.

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Definitions of insulator

insulator (n.)
a material such as glass or porcelain with negligible electrical or thermal conductivity;
Synonyms: dielectric / nonconductor
From wordnet.princeton.edu