tarsus (n.) Look up tarsus at Dictionary.com
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).