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thumbnail

[thuhm-neyl] /ˈθʌmˌneɪl/
noun
1.
the nail of the thumb.
2.
anything quite small or brief, as a small drawing or short essay.
3.
Printing. a small, rough dummy.
4.
Also called porkchop. Journalism, Printing. a half-column portrait in a newspaper.
adjective
5.
quite small or brief; concise:
a thumbnail description of Corsica.
verb (used with object)
6.
to make a thumbnail sketch or description of.
Origin of thumbnail
1595-1605
1595-1605; thumb + nail
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thumbnail

thumbnail

/ˈθʌmˌneɪl/
noun
1.
the nail of the thumb
2.
(modifier) concise and brief: a thumbnail sketch
3.
(computing) a small image which can be expanded
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
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Word Origin and History for thumbnail
n.

c.1600, from thumb (n.) + nail (n.). Meaning "drawing or sketch of a small size" (though usually not lierally the size of a thumbnail) is from 1852.

Online Etymology Dictionary, © 2010 Douglas Harper
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thumbnail in Technology
file format, graphics
(From "thumbnail sketch") A file format used by Graphics Workshop for Microsoft Windows. Filename extension: ".thn".
[What's in the files?]
(1996-05-28)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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16
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