rognon

noun
ro·​gnon | \(ˈ)rōn¦yōⁿ, (ˈ)rȯn-\
plural -s

Definition of rognon 

: a small rounded mass of rock usually embedded in rock of a different type

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First Known Use of rognon

1853, in the meaning defined above

History and Etymology for rognon

French, literally, kidney, from (assumed) Vulgar Latin renion-, renio, from Latin renes (plural) kidneys

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The first known use of rognon was in 1853

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