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a. The short thick digit of the human hand, next to the index finger and opposable to each of the other four digits.
b. A corresponding digit in other animals, especially primates. Also called pollex.
2. The part of a glove or mitten that covers the thumb.
3. Architecture An ovolo.
v. thumbed, thumb·ing, thumbs
1. To scan (written matter) by turning over pages with or as if with the thumb.
2. To disarrange, soil, or wear by careless or frequent handling.
3. Informal To solicit (a ride) from a passing vehicle by signaling with the thumb.
1. To scan written matter by turning over pages with or as if with the thumb: thumbed through the latest issue of the magazine.
2. Informal To hitchhike.
all thumbs
Lacking physical coordination, skill, or grace; clumsy.
thumb (one's) nose
To express scorn or ridicule, often by placing the thumb on the nose and wiggling the fingers.
under (someone's) thumb
Under the control of someone; subordinate to.

[Middle English, from Old English thūma; see teuə- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.thumbed - (of pages) worn or soiled by thumb and fingers by frequent handling or turning; "well-thumbed pages of the dictionary"
worn - affected by wear; damaged by long use; "worn threads on the screw"; "a worn suit"; "the worn pockets on the jacket"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.