prefab (adj.)youdaoicibaDictYouDict[prefab 词源字典]
1937, short for prefabricated (see prefabricate). As a noun, "prefabricated housing," from 1942.[prefab etymology, prefab origin, 英语词源]
prefabricate (v.)youdaoicibaDictYouDict
1919 (implied in prefabricated), from pre- + fabricate (v.). Related: Prefabricating.