parallax

[ par-uh-laks ]

/ ˈpær əˌlæks /

noun

the apparent displacement of an observed object due to a change in the position of the observer.

Astronomy. the apparent angular displacement of a celestial body due to its being observed from the surface instead of from the center of the earth (diurnal parallax, or geocentric parallax ) or due to its being observed from the earth instead of from the sun (annual parallax or heliocentric parallax ).Compare parallactic ellipse.

the difference between the view of an object as seen through the picture-taking lens of a camera and the view as seen through a separate viewfinder.

an apparent change in the position of cross hairs as viewed through a telescope, when the focusing is imperfect.

Digital Technology. a 3D effect observed when images and other elements in the foreground of a screen move at a different rate than those in the background (often used attributively): parallax scrolling;Does this phone have parallax?

Origin of parallax

First recorded in 1585–95; from Greek parállaxis “alternation, change of position” derivative of parallássein “to cause to alternate,” equivalent to para- + allássein “to change, alter, vary” (derivative of állos “other”) + -sis;see origin at para-¹, allo--sis

OTHER WORDS FROM parallax

par·al·lac·tic

[par-uh-lak-tik], /ˌpær əˈlæk tɪk/, adjectivepar·al·lac·ti·cal·ly, adverb

Words nearby parallax

paralipomena, Paralipomenon, paralipsis, parallactic ellipse, parallactic motion, parallax, parallax test, parallel, parallel bars, parallel circuit, parallel cousin

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for parallax

Hooke believed he had found a parallax for the bright star in the Head of the Dragon; but was deceived.
A Popular History of Astronomy During the Nineteenth Century|Agnes M. (Agnes Mary) Clerke
Bessel had anticipated him with the parallax of 61 Cygni by just two months.
A Popular History of Astronomy During the Nineteenth Century|Agnes M. (Agnes Mary) Clerke
It is only the difference between the parallax of the star and that of the comparison star.
The Story of the Heavens|Robert Stawell Ball
In such a case, no matter how near the stars were to the earth, no parallax could be detected.
The Story of the Heavens|Robert Stawell Ball

The parallax of Canopus is very small, so its distance from the earth is very great, and it must be a sun of gigantic size.
Astronomical Curiosities|J. Ellard Gore

British Dictionary definitions for parallax

parallax

/ (ˈpærəˌlæks) /

noun

an apparent change in the position of an object resulting from a change in position of the observer

astronomy the angle subtended at a celestial body, esp a star, by the radius of the earth's orbit. Annual or heliocentric parallax is the apparent displacement of a nearby star resulting from its observation from the earth. Diurnal or geocentric parallax results from the observation of a planet, the sun, or the moon from the surface of the earth

Derived forms of parallax

parallactic (ˌpærəˈlæktɪk), adjectiveparallactically, adverb

Word Origin for parallax

C17: via French from New Latin parallaxis, from Greek: change, from parallassein to change, from para- 1 + allassein to alter

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for parallax

parallax

[ păr′ə-lăks′ ]

n.

The apparent displacement of an object caused by a change in the position from which it is viewed.

Other words from parallax

par′al•lac′tic (-lăk′tĭk) adj.

Scientific definitions for parallax

parallax

[ păr′ə-lăks′ ]

A change in the apparent position of an object relative to more distant objects, caused by a change in the observer's line of sight towards the object. The parallax of nearby stars caused by observing them from opposite points in Earth's orbit around the Sun is used in estimating the stars' distance from Earth through triangulation.

单词	parallax
释义	parallax [ par-uh-laks ] / ˈpær əˌlæks / noun the apparent displacement of an observed object due to a change in the position of the observer. Astronomy. the apparent angular displacement of a celestial body due to its being observed from the surface instead of from the center of the earth (diurnal parallax, or geocentric parallax ) or due to its being observed from the earth instead of from the sun (annual parallax or heliocentric parallax ).Compare parallactic ellipse. the difference between the view of an object as seen through the picture-taking lens of a camera and the view as seen through a separate viewfinder. an apparent change in the position of cross hairs as viewed through a telescope, when the focusing is imperfect. Digital Technology. a 3D effect observed when images and other elements in the foreground of a screen move at a different rate than those in the background (often used attributively): parallax scrolling;Does this phone have parallax? Origin of parallax First recorded in 1585–95; from Greek parállaxis “alternation, change of position” derivative of parallássein “to cause to alternate,” equivalent to para- + allássein “to change, alter, vary” (derivative of állos “other”) + -sis;see origin at para-¹, allo--sis OTHER WORDS FROM parallax par·al·lac·tic [par-uh-lak-tik], /ˌpær əˈlæk tɪk/, adjectivepar·al·lac·ti·cal·ly, adverb Words nearby parallax paralipomena, Paralipomenon, paralipsis, parallactic ellipse, parallactic motion, parallax, parallax test, parallel, parallel bars, parallel circuit, parallel cousin Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for parallax Hooke believed he had found a parallax for the bright star in the Head of the Dragon; but was deceived. A Popular History of Astronomy During the Nineteenth Century\|Agnes M. (Agnes Mary) Clerke Bessel had anticipated him with the parallax of 61 Cygni by just two months. A Popular History of Astronomy During the Nineteenth Century\|Agnes M. (Agnes Mary) Clerke It is only the difference between the parallax of the star and that of the comparison star. The Story of the Heavens\|Robert Stawell Ball In such a case, no matter how near the stars were to the earth, no parallax could be detected. The Story of the Heavens\|Robert Stawell Ball The parallax of Canopus is very small, so its distance from the earth is very great, and it must be a sun of gigantic size. Astronomical Curiosities\|J. Ellard Gore British Dictionary definitions for parallax parallax / (ˈpærəˌlæks) / noun an apparent change in the position of an object resulting from a change in position of the observer astronomy the angle subtended at a celestial body, esp a star, by the radius of the earth's orbit. Annual or heliocentric parallax is the apparent displacement of a nearby star resulting from its observation from the earth. Diurnal or geocentric parallax results from the observation of a planet, the sun, or the moon from the surface of the earth Derived forms of parallax parallactic (ˌpærəˈlæktɪk), adjectiveparallactically, adverb Word Origin for parallax C17: via French from New Latin parallaxis, from Greek: change, from parallassein to change, from para- 1 + allassein to alter Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for parallax parallax [ păr′ə-lăks′ ] n. The apparent displacement of an object caused by a change in the position from which it is viewed. Other words from parallax par′al•lac′tic (-lăk′tĭk) adj. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for parallax parallax [ păr′ə-lăks′ ] A change in the apparent position of an object relative to more distant objects, caused by a change in the observer's line of sight towards the object. The parallax of nearby stars caused by observing them from opposite points in Earth's orbit around the Sun is used in estimating the stars' distance from Earth through triangulation. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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