thumbnail

[thuhm-neyl]
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:
1595–1605; thumb + nail

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
thumbnail (ˈθʌmˌneɪl)
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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FOLDOC
Computing Dictionary

thumbnail definition

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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Example sentences
The whole code of her laws may be written on the thumbnail, or the signet of a
  ring.
Click once on the one you want and a down arrow appears on the right of that
  slide thumbnail.
The smallest known dragonfly is about the size of your thumbnail.
Each thumbnail in the carousel above is a different piece of the map you will
  need to download.
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