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eburnation

e·bur·na·tion [ bər náysh'n, èbbər náysh'n ]


noun 
Definition:
 
hardening of the bone surface: a hardening of the surfaces of bones in a joint as a result of the loss of their cartilage covering, occurring in such medical conditions as osteoarthritis

[Mid-19th century. < Latin eburnus "made of ivory" < ebur "ivory"]
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