hologram

[hol-uh-gram, hoh-luh-]
noun Optics.
  1. a negative produced by exposing a high-resolution photographic plate, without camera or lens, near a subject illuminated by monochromatic, coherent radiation, as from a laser: when it is placed in a beam of coherent light a true three-dimensional image of the subject is formed.

Origin of hologram

First recorded in 1945–50; holo- + -gram1
Also called holograph.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hologram

Contemporary Examples of hologram

Historical Examples of hologram

  • The idea of a hologram serves as a way of understanding self and other.

  • Pri-bram offers us an interesting view on relationships in his discussion of hologram.


British Dictionary definitions for hologram

hologram

noun
  1. a photographic record produced by illuminating the object with coherent light (as from a laser) and, without using lenses, exposing a film to light reflected from this object and to a direct beam of coherent light. When interference patterns on the film are illuminated by the coherent light a three-dimensional image is produced
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

Word Origin and History for hologram
n.

1949, coined by Hungarian-born British scientist Dennis Gabor (Gábor Dénes), 1971 Nobel prize winner in physics for his work in holography; from Greek holos "whole" (in sense of three-dimensional; see safe (adj.)) + -gram.

Online Etymology Dictionary, © 2010 Douglas Harper

hologram in Medicine

hologram

[hŏlə-grăm′, hōlə-]
n.
  1. A three-dimensional diffraction pattern of the image of an object made using holography.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

hologram in Science

hologram

[hŏlə-grăm′, hōlə-]
  1. A three-dimensional image of an object made by holography.
A Closer Look: To produce a simple hologram, a beam of coherent, monochromatic light, such as that produced by a laser, is split into two beams. One part, the object or illumination beam, is directed onto the object and reflected onto a high-resolution photographic plate. The other part, the reference beam, is beamed directly onto the photographic plate. The interference pattern of the two light beams is recorded on the plate. When the developed hologram is illuminated from behind (in the same direction as the original reference beam) by a beam of coherent light, it projects a three-dimensional image of the original object in space, shifting in perspective when viewed from different angles. Appropriately enough, the word hologram comes from the Greek words holos, “whole,” and gramma, “message.” If a hologram is cut into pieces, each piece projects the entire image, but as if viewed from a smaller subset of angles. The large amount of information contained in holograms makes them harder to forge than two-dimensional images. Many credit cards, CDs, sports memorabilia, and other items include holographic stickers as indicators of authenticity. Holography is used in many fields, including medicine, data storage, architecture, engineering, and the arts.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.