from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A nonconductor of electricity, especially a substance with electrical conductivity of less than a millionth (10-6) of a siemens.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An electrically insulating or nonconducting material considered for its electric susceptibility, i.e. its property of polarization when exposed to an external electric field.
- adj. insulating
from the GNU version of the Collaborative International Dictionary of English
- n. Any substance or medium that transmits the electric force by a process different from conduction, as in the phenomena of induction; a nonconductor, separating a body electrified by induction, from the electrifying body.
from The Century Dictionary and Cyclopedia
- Transmitting electric effects without conduction; nonconducting.
- n. A substance through or across which electric force is acting.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a material such as glass or porcelain with negligible electrical or thermal conductivity
di(a)- + electric.(American Heritage® Dictionary of the English Language, Fourth Edition)
From dia- ("through") + electric. Learned 19th-century formation, coined by William Whewell (died 1866). (Wiktionary)