different between defrosting vs thawing

English

defrosting

defrosting (plural defrostings)

thaw +? -ing

thawing

thawing (plural thawings)

The process by which something thaws.
- 1829, James Macauley, The natural, statistical, and civil history of the state of New York
  Hence, there is a succession of thawings and freezings. The former expand, and endeavour to restore the surface of the ground to its natural condition, while the latter contract and harden it.

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