Relating to or characterized by diagonals; having a diagonal arrangement or structure.
From Greek dia- (through) + gonia (angle) plus the suffix -ic meaning 'relating to or characterized by.' This is a formal geometric or scientific term.
The suffix -ic transforms nouns into adjectives describing essential qualities, so 'diagonic' means 'of or relating to diagonals'—the same pattern we see in 'atomic' (relating to atoms) and 'chronic' (relating to time/chronos). It's a linguistic shortcut mathematicians love.
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