Wiktionary
heel bone
n. The large bone making up the heel of the human foot.
Usage examples of "heel bone".
With Rakella now following her every move, the Rowan repeated the hard pressure on the sole, began to massage the whole foot, warming the flesh, then gently and lightly rubbing the main bones from toe to heel bone.
Sharpe was pulling on a damp boot that refused to go over his heel bone.