[ 'parəlaks ]
■ noun
1》 the apparent difference in the position of an object when viewed from different positions, e.g. through the viewfinder and the lens of a camera.
2》 Astronomy the angular difference in the apparent positions of a star observed from opposite sides of the earth's orbit.
Derivatives
parallactic adjective
Origin
C16: from Fr. ~e , from Gk ~is 'a change', from parallassein 'to alternate'.