Definition of arris in English:

arris

noun

Architecture
  • A sharp edge formed by the meeting of two flat or curved surfaces.

    • ‘He noticed the two arris hip tiles that had fallen and saw that two adjacent tiles had become dislodged.’

Pronunciation

arris

/ˈerəs/ /ˈɛrəs/

Origin

Late Middle English (in arris-wise): alteration of Old French areste ‘sharp ridge’, earlier form of arête.