arris

noun
ar·​ris | \ˈa-rəs, ˈer-əs\
plural arris or arrises

Definition of arris 

: the sharp edge or salient angle formed by the meeting of two surfaces especially in moldings

First Known Use of arris

15th century, in the meaning defined above

History and Etymology for arris

probably modification of Middle French areste, literally, fishbone, from Late Latin arista — more at arête

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The first known use of arris was in the 15th century

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