-ˌlād.ə(r), -ātə- noun
( -s )
1. : one that insulates ; especially : a worker that applies electrical or thermal insulation
2.
a. : a material or body that is a poor conductor of electricity, heat, or sound
b. : a body of electrically nonconducting material for keeping charged conductors from contact with each other or from grounding and often also for supporting them