Definition of "thumbnail" []

• The nail of the thumb. (noun)
• Computer Science A reduced image of a graphic or document page, used in order to view multiple images on a screen simultaneously or to download such images more rapidly. (noun)
• Of, relating to, or of the size of a thumbnail. (adjective)
• Brief; cursory: a thumbnail biography. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Worse, the color of the bar below a thumbnail is meaningless -- it is pulled from one of the colors used for the Web site's favicon and, otherwise, does not appear to convey any important technical information."
• "I find it easier to script if I draw everything out in thumbnail form first; the graphics hold together the flow of the story."
• "This will display the file size, for images, the dimensions, and for folders, the number of items inside below each in thumbnail view."