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[in-suh-leyt, ins-yuh-] /ˈɪn səˌleɪt, ˈɪns yə-/
verb (used with object), insulated, insulating.
to cover, line, or separate with a material that prevents or reduces the passage, transfer, or leakage of heat, electricity, or sound:
to insulate an electric wire with a rubber sheath; to insulate a coat with down.
to place in an isolated situation or condition; segregate.
Origin of insulate
1530-40; < Latin insulātus made into an island. See insula, -ate1
Related forms
noninsulating, adjective
preinsulate, verb (used with object), preinsulated, preinsulating.
reinsulate, verb (used with object), reinsulated, reinsulating.
superinsulated, adjective
uninsulated, adjective
well-insulated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for insulated


verb (transitive)
to prevent or reduce the transmission of electricity, heat, or sound to or from (a body, device, or region) by surrounding with a nonconducting material
to isolate or detach
Word Origin
C16: from Late Latin insulātus: made into an island
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for insulated



1530s, "make into an island," from Latin insulatus, from insula (see insular). Sense of "cause a person or thing to be detached from surroundings" is from 1785. Electrical/chemical sense of "block from electricity or heat" is from 1742. Related: Insulated; insulating.

Online Etymology Dictionary, © 2010 Douglas Harper
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