v. t. To remove the frost or ice from; as, to defrost the car window; to defrost a refrigerator. Syn. -- deice. [ WordNet 1.5 ]
v. i. 1. To become free of frost or ice; as, it took four hours for the refrigerator to defrost. Syn. -- deice. [ PJC ]
2. To thaw; -- used especially of items removed from a freezer, such as frozen foods. [ PJC ]
n. A device that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane). Syn. -- deicer. [ WordNet 1.5 ]