orthogonal
‘relating to or composed of right angles’
Lexical development traced from the Tamil root:
E.orthogonall < F. orthogonal < orthogone < La.Lat. orthogonius < Gk. orthogonios ‘right-angled’ < ortho- ‘straight’ < orthos ‘straight, true, correct, regular’ + gōnia ‘angle, corner’ < awthaw < eredh- < Tamil uṟu