calcaneus
noun
cal·ca·ne·us kal-ˈkā-nē-əs 
plural calcanei
kal-ˈkā-nē-ˌī
: a tarsal bone that in humans is the large bone of the heel
Example Sentences
Recent Examples on the Web The usual signs and symptoms include pain on the bottom of the heel, which could present as dull, sharp, or a burning ache, either directly below the calcaneus (heel bone) or toward the front of it. 
Outside Online, 17 June 2019 The medical literature back then had nothing on fractures of the calcaneus, or heel bone, even though those are the most common fractures of the foot. Breanna Draxler, National Geographic, 21 Aug. 2020 On my right side, the calcaneus—the heel—was broken into at least six pieces. Ula Chrobak, Outside Online, 9 May 2018 So, in space there’s a lot of bone degradation so there’s a lot of osteoporosis, especially in the calcaneus, the heel bone. Kristi Myllenbeck, The Mercury News, 7 Apr. 2017
Outside Online, 17 June 2019 The medical literature back then had nothing on fractures of the calcaneus, or heel bone, even though those are the most common fractures of the foot. Breanna Draxler, National Geographic, 21 Aug. 2020 On my right side, the calcaneus—the heel—was broken into at least six pieces. Ula Chrobak, Outside Online, 9 May 2018 So, in space there’s a lot of bone degradation so there’s a lot of osteoporosis, especially in the calcaneus, the heel bone. Kristi Myllenbeck, The Mercury News, 7 Apr. 2017 Word History
Etymology
Late Latin, heel, alteration of Latin calcaneum
First Known Use
1657, in the meaning defined above
Medical Definition
calcaneus
noun
cal·ca·ne·us -nē-əs
plural calcanei -nē-ˌī
: a tarsal bone that in humans is the large bone of the heel
called also heel bone, os calcis