clonus (n.)youdaoicibaDictYouDict[clonus 词源字典]
"violent muscular spasms," 1817, from Modern Latin, from Greek klonos "turmoil, any violent motion; confusion, tumult, press of battle," from PIE *kel- "to drive, set in motion." Related: Clonic; clonicity.[clonus etymology, clonus origin, 英语词源]