Sheetrock (n.)youdaoicibaDictYouDict[Sheetrock 词源字典]
1921, proprietary name (claiming use from 1917) of a type of plaster wall-board, U.S. Gypsum Co., Chicago, Ill.; from sheet (n.1) + rock (n.).[Sheetrock etymology, Sheetrock origin, 英语词源]