daguerreotype

American  

[duh-gair-uh-tahyp, -ee-uh-tahyp] / dəˈgɛər əˌtaɪp, -i əˌtaɪp /

noun

1. an obsolete photographic process, invented in 1839, in which a picture made on a silver surface sensitized with iodine was developed by exposure to mercury vapor.

2. a picture made by this process.

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verb (used with object)

daguerreotyped, daguerreotyping

1. to photograph by this process.

daguerreotype British  

/ dəˈɡɛrəʊˌtaɪp /

noun

1. one of the earliest photographic processes, in which the image was produced on iodine-sensitized silver and developed in mercury vapour

2. a photograph formed by this process

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Other Word Forms

Derived Forms

• daguerreotypist
  noun
• daguerreotypy
  noun
• daguerreotypic
  adjective
• daguerreotyper
  noun

Etymology

Origin of daguerreotype

1830–40; named after L. J. M. Daguerre; see -o-, -type

Explanation

An old-fashioned black-and-white photograph with a shiny, almost mirror-like surface is a daguerreotype. The daguerreotype was named for its inventor, Louis Daguerre, known as one of the fathers of photography. Daguerre's 1837 process involved using a sheet of copper that was coated with a thin layer of silver and needed just 20 minutes of exposure; it replaced an earlier method that required eight hours to produce an image. Less expensive types of photography made the daguerreotype obsolete within 20 years, and today they're extremely rare.