In the manner or direction of an arris; positioned along a sharp edge or corner.
Compound of 'arris' plus '-wise,' where '-wise' is a suffix meaning 'in the manner of' or 'in the direction of,' creating parallel construction with 'arrisways.'
The '-wise' suffix created tons of directional words in English—'clockwise,' 'likewise,' 'otherwise'—and 'arriswise' is a perfect example of how the suffix let builders invent new positioning terms without needing to explain them every time.
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