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

1890–95; de- + frost Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
defrost (diːˈfrɒst)
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1895, from de- + frost.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The growth came back quickly even after a defrost and bleach cleaning.
For each portion, thaw three or four cubes in a microwave on the defrost setting.
The number of defrost cycles required for a display case is dependent upon its type and design.
Automatic, manual, and partial automatic are the standard defrost types.
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