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The nail of the thumb.
(noun)
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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)
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Of, relating to, or of the size of a thumbnail.
(adjective)
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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.