parallax
‘apparent displacement of an object observed, due to an actual displacement of the observer’
Lexical development traced from the Tamil root:
E. paralaxe, parallaxe, paralex, paralax < F. parallaxe< Gk. parallaxis ‘change, alteration, inclination of two lines meeting at an angle’ < parallassein‘to alter, make things alternate’ < para- + allassein ‘to change’ < allos ‘other’ < uhl < al- < Tamil al