calcaneus
cal.ca.ne.us \-ne--*s\ \-ne--.i-\ n or cal.ca.nei [LL, heel, alter. of L calcaneum] pl : a tarsal bone that in man is the great bone of the heel
Webster's English Dictionarycal.ca.ne.us \-ne--*s\ \-ne--.i-\ n or cal.ca.nei [LL, heel, alter. of L calcaneum] pl : a tarsal bone that in man is the great bone of the heel