This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To remove ice or frost from: defrosted the windshield.

v. To cause to thaw.

verb-intransitive. To become free of ice or frost: a freezer that defrosts automatically.

verb-intransitive. To become thawed.

v. To remove frost from.

v. To thaw something.

v. To recover from something tiresome.

v. To remove the frost or ice from.

verb-intransitive. To become free of frost or ice.

verb-intransitive. To thaw; -- used especially of items removed from a freezer, such as frozen foods.

To remove the effects of frost or freezing from; restore to a sound unfrozen condition or state.

v. make or become free of frost or ice

"For this, perhaps you mean season 8 episode "New Order" when they "defrost" Jack and he sees that Teal'c has hair and he starts asking "Teal'c, what's with the hair?""

defrosted    defrosting    defrosts   

unfreeze    dethaw    unthaw    thaw    melt    dissolve   

autodefrost   

deice    thaw   

Aust    Frost    accost    cost    crossed    embossed    exhaust    frost    glossed    last   

two-position    tricarboxylic    three-position    cut-in    circulator    solenoid-operated    light-sensitive    expiratory