noun
insulator; electrical insulator
Technical term in physics and electrical engineering for a material that does not conduct electricity.
ゴムは良い絶縁体です。
Rubber is a good insulator.
絶縁体は電気を通しません。
Insulators do not conduct electricity.
半導体 (semiconductor) has conductivity between a conductor and an insulator.
Compound of 絶縁 (ぜつえん, 'insulation') + 体 (たい, 'body, substance'). 絶縁 itself is from 絶 (ぜつ, 'sever') + 縁 (えん, 'connection, edge').