a small particle of bread, cake, etc., that has broken off.
a small particle or portion of anything; fragment; bit.
the soft inner portion of a bread (distinguished from crust ).
crumbs, a cake topping made of sugar, flour, butter, and spice, usually crumbled on top of the raw batter and baked with the cake.
Slang. a contemptibly objectionable or worthless person.
verb (used with object)
Cookery. to dress or prepare with crumbs.
to break into crumbs or small fragments.
to remove crumbs from: The waiter crumbed the table.

before 1000; Middle English crome, crume, Old English cruma; akin to Dutch kruim, German Krume crumb, Latin grūmus heap of earth

crumbable, adjective
crumber, noun
decrumb, verb (used with object)

2. scrap, shred, morsel, sliver, speck. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crumb (krʌm)
1.  a small fragment of bread, cake, or other baked foods
2.  a small piece or bit: crumbs of information
3.  the soft inner part of bread
4.  slang a contemptible person
5.  (tr) to prepare or cover (food) with breadcrumbs
6.  to break into small fragments
7.  (esp of pie crusts) made with a mixture of biscuit crumbs, sugar, etc
[Old English cruma; related to Middle Dutch krome, Middle High German krūme, Latin grūmus heap of earth]

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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Word Origin & History

O.E. cruma, from a W.Gmc. root of obscure origin. The -b- appeared c.1450, in part by analogy with words like dumb, in part from crumble. Slang meaning "lousy person" is 1918, from crumb, U.S. slang for "body-louse" (1863), so called from resemblance.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

crumb definition

data, jargon
(Or tayste /tayst/) Silly suggested term for two binary digits.
The term "quarter" has also been suggested, referring to the US 25-cent coin. This was once equal in value to two of the eight "bits" - pie-slice-shaped "pieces of eight" - into which Spanish silver crowns were cut to make change.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Knead the ground beef together with salt, and then add the bread crumb mix.
One crumb of comfort for euro-zone firms is that the currency has plunged
  against the dollar.
There is perhaps one other crumb of comfort for the president.
The honey interacts with the yeast, and both give the crumb a tenderness it
  lacks using the basic recipe.
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