σφυρόν G4974
sphyrón · sfoo-ron' · Noun Neuter
neuter of a presumed derivative probably of the same as (a ball, "sphere"; compare the feminine , a hammer); the ankle (as globular):--ancle bone.
1 Occurrence in the King James Bible
Acts 3:7And he took him by the right hand, and lifted him up: and immediately his feet and ankle bones received strength.