Etymology
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calcaneus (n.)

"heel-bone," 1751, from Latin (os) calcaneum "bone of the heel," from calcem (nominative calx (1)) "heel," a word of uncertain origin, perhaps from Etruscan. De Vaan lists as possible cognates Old Prussian culczi "hip," Lithuanian kulkšnis "ankle-(bone)," Bulgarian kalka "hip, thigh." Related: Calcaneal.

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Definitions of calcaneus

calcaneus (n.)
the largest tarsal bone; forms the human heel;
Synonyms: heelbone / os tarsi fibulare
From wordnet.princeton.edu