Crossword clue: a material such as glass or porcelain with negligible electrical or thermal conductivity

dielectric, insulator, nonconductor.

The most common answer is dielectric (10 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

dielectric 10 letters wn-def

a material such as glass or porcelain with negligible electrical or thermal conductivity

insulator 9 letters wn-def

a material such as glass or porcelain with negligible electrical or thermal conductivity

nonconductor 12 letters wn-def

a material such as glass or porcelain with negligible electrical or thermal conductivity