diplodocus (n.)youdaoicibaDictYouDict[diplodocus 词源字典]
1884, coined in Modern Latin in 1878 by U.S. paleontologist Othniel Charles Marsh (1831-1899) from Greek diploos "double" (see diploid) + dokos "a beam." So called for the peculiar structure of the tail bones.[diplodocus etymology, diplodocus origin, 英语词源]