de-frost

defrost

[dih-frawst, -frost]
verb (used with object)
1.
to remove the frost or ice from: to defrost a refrigerator; to defrost the windshield of a car.
2.
to thaw or partially thaw (frozen food).
verb (used without object)
3.
to become free of ice or frost: The refrigerator defrosted quickly.
4.
to thaw, as frozen food: The meat took two hours to defrost.

Origin:
1890–95; de- + frost

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
defrost (diːˈfrɒst)
 
vb
1.  to make or become free of frost or ice
2.  to thaw, esp through removal from a refrigerator

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

defrost
1895, from de- + frost.
Online Etymology Dictionary, © 2010 Douglas Harper
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Synonyms
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