parallax

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noun par·al·lax \ˈper-ə-ˌlaks, ˈpa-rə-\

Definition of parallax

  1. :  the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object; especially :  the angular difference in direction of a celestial body as measured from two points on the earth's orbit

Origin and Etymology of parallax

Middle French parallaxe, from Greek parallaxis, from parallassein to change, from para- + allassein to change, from allos other


First Known Use: 1580


Medical Dictionary

parallax

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noun par·al·lax \ˈpar-ə-ˌlaks\

Medical Definition of parallax

  1. :  the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object motion parallax governs the way objects appear to move when the eyes or head are shifted—Edmund Andrews


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