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| either of two flat, triangular bones each forming the back part of a shoulder |
| lower portion of either innominate bone |
calcaneus cal·ca·ne·us (kāl-kā'nē-əs) or cal·ca·ne·um (-nē-əm)
n. pl. cal·ca·ne·i (-nē-ī') or cal·ca·ne·a (-nē-ə)
The quadrangular bone at the back of the tarsus, the largest of the tarsal bones. Also called heel bone.