injection (n.)youdaoicibaDictYouDict[injection 词源字典]
"forcing a fluid into a body" (with a syringe, etc.), early 15c., from Middle French iniection (14c.) or directly from Latin iniectionem (nominative iniectio), noun of action from past participle stem of inicere (see inject).[injection etymology, injection origin, 英语词源]