tendon (n.)youdaoicibaDictYouDict[tendon 词源字典]
1540s, from Medieval Latin tendonem (nominative tendo), altered (by influence of Latin tendere "to stretch") from Late Latin tenon, from Greek tenon (genitive tenontos) "tendon, sinew," from PIE *ten-on- "something stretched," from root *ten- "to stretch" (see tenet).[tendon etymology, tendon origin, 英语词源]