periosteoma

noun
peri·​os·​te·​o·​ma | \ˌperēˌästēˈōmə\
plural periosteomas\ -​məz \ or periosteomata\ -​mətə \

Definition of periosteoma 

: a tumor on the outer surface of a bone

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History and Etymology for periosteoma

New Latin, from periost- + -oma

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