Plain English Meaning
Something that electricity cannot easily pass through. It is used to keep electric current out of places it should not go.
Full Definition
A material that resists the flow of electric current, used to block or contain electricity rather than conduct it. In aircraft construction, insulators separate conductive parts so that current follows only the intended path.
Context Anchor
Seen in aircraft electrical systems and lightning strike protection discussions, especially when describing which parts carry electricity and which parts separate or protect them.
Derivation
From the Latin insulare, meaning 'to make into an island.' An insulator effectively turns a part into an electrical island — current cannot reach it or leave it through the insulating material.
Why Pilots Care
Aircraft use insulating materials to direct current safely along the exterior and avoid damage to internal or .