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self-defrosting
self-defrosting adj. 
/ˌsɛlfdᵻˈfrɒstɪŋ/, /ˌsɛlfdiˈfrɔstɪŋ/, /ˌsɛlfdəˈfrɑstɪŋ/, /ˌsɛlfdiˈfrɑstɪŋ/
Brit. /ˌsɛlfdiːˈfrɒstɪŋ/
, /ˌsɛlfdiːˈfrɒstɪŋ//ˌsɛlfdᵻˈfrɒstɪŋ/U.S. /ˌsɛlfdəˈfrɔstɪŋ/
, /ˌsɛlfdəˈfrɔstɪŋ//ˌsɛlfdiˈfrɔstɪŋ//ˌsɛlfdəˈfrɑstɪŋ//ˌsɛlfdiˈfrɑstɪŋ/ΚΠ
1926 N.Y. Times 26 Sept. (Mag.) 18/ 5 (advt.) An electric refrigerator that is self-defrosting.
2007 Washington Post (Nexis) 1 Aug. f4 Self-defrosting freezers are the bane of ice cream sandwiches. As the temperature fluctuates to prevent frost, ice crystals build up in ice cream or sorbet.
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