The story
- Ancient Greek · derived fromὀρθογώνιος“rectangular”
- Latin · derived fromorthogōnius“right-angled”
- Medieval Latin · derived fromorthogōnālis
- Middle French · borrowed fromorthogonal
- English todayorthogonal
From Middle French orthogonal, in turn from Medieval Latin orthogōnālis and Latin orthogōnius (“right-angled”), ultimately from Ancient Greek ὀρθογώνιος (orthogṓnios, “rectangular”). By surface analysis, ortho- + -gon + -al.
Words from the same roots
Ancient Greekὀρθογώνιος all →
orthogonium
Etymology from Wiktionary, CC BY-SA 4.0.