say it: dahy-uh-LEK-trik
dielectric is a noun meaning "a material such as glass or porcelain with negligible electrical or thermal conductivity". It carries one recorded sense.
a material such as glass or porcelain with negligible electrical or thermal conductivity
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for dielectric come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.