tarsus (n.)youdaoicibaDictYouDict[tarsus 词源字典]
the ankle bones collectively, 1670s, Modern Latin, from Greek tarsos "ankle, sole of the foot, rim of the eyelid," originally "flat surface, especially for drying," from PIE root *ters- "to dry" (cognates: Greek teresesthai "to be or become dry," tersainein "to make dry;" Latin terra "land, ground, soil," torrere "dry up, parch;" see terrain). The connecting notion is the bones of the "flat" of the foot (Greek tarsos podos).[tarsus etymology, tarsus origin, 英语词源]