1. A non-conductor.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• insulaiton,
• insultor,
• isulator,
• insulatd,
• insulaion,
• insulatio,
• insulater,
• insulatin,
• insulatoin,
• insalator,
• inslatior,
• insolator,
• insulaton,
• inselators,
• instollator,
• insluator,
• insualtor,
• insullator,
• insecator,
• insidator

• inosculate,
• insulin,
• inculpation,
• inoculation,
• inoculating,
• inculcate,
• insulation,
• insult,
• innoculate,
• inosculation,
• insularity,
• inoculate,
• INSULA,
• insularism,
• insulate,
• inculcation,
• inculpative,
• inoculant,
• insulates,
• inoculator,
• insulant,
• inculpatory,
• Inclan,
• insular,
• inculpate,
• Insulated.

The adjective form of the word "insulator" is "insulating".

The plural of the "insulator" can be the "insulators".

The singular of the "insulator" can be the "insulator".