- The calcaneus is the heel bone. It is also called the os calcis. The calcaneus is a more or less rectangular bone at the back of the foot. The word "calcaneus" comes from the Latin calx meaning limestone. The heel bone looked like a lump of chalk (to someone). The word "calcium" also comes from calx.
* * *1. [TA] The largest of the tarsal bones; it forms the heel and articulates with the cuboid anteriorly and the talus above. SYN: calcaneal bone, calcaneum, heel bone, os calcis. 2. SYN: talipes c.. [L. the heel (another form of calcaneum)]
* * *cal·ca·ne·us -nē-əs n, pl -nei -nē-.ī a tarsal bone that in humans is the large bone of the heel called also heel bone, os calcis
* * *n.the large bone in the tarsus of the foot that forms the projection of the heel behind the foot. It articulates with the cuboid bone in front and with the talus above.
* * *cal·ca·ne·us (kal-kaґne-əs) pl. calcaґnei [L., from calx heel] 1. [TA] the irregular quadrangular bone at the back of the tarsus; called also calcaneal bone, calcaneum, heel bone, os calcis, and os tarsi fibulare. 2. talipes calcaneus. calcaneal adj
Medical dictionary. 2011.