clump

[kluhmp]
noun
1.
a small, close group or cluster, especially of trees or other plants.
2.
a lump or mass
3.
a heavy, thumping step, sound, etc.
4.
Immunology. a cluster of agglutinated bacteria, red blood cells, etc.
5.
a thick extra sole on a shoe.
verb (used without object)
6.
Also, clomp. to walk heavily and clumsily.
7.
Immunology. to gather or be gathered into clumps; agglutinate.
verb (used with object)
8.
to gather or form into a clump; mass.

Origin:
1580–90; akin to Dutch klompe lump, mass, Old English clympre lump of metal

clumpy, clumpish, clumplike, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clump (klʌmp)
 
n
1.  a cluster, as of trees or plants
2.  a dull heavy tread or any similar sound
3.  an irregular mass: a clump of hair or earth
4.  an inactive mass of microorganisms, esp a mass of bacteria produced as a result of agglutination
5.  an extra sole on a shoe
6.  slang a blow
 
vb
7.  (intr) to walk or tread heavily
8.  to gather or be gathered into clumps, clusters, clots, etc
9.  to cause (bacteria, blood cells, etc) to collect together or (of bacteria, etc) to collect together
10.  slang (tr) to punch (someone)
 
[Old English clympe; related to Middle Dutch klampe heap of hay, Middle Low German klampeclamp², Swedish klimp small lump]
 
'clumpy
 
adj
 
'clumpiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

clump
1586, from Du. klomp "lump, mass," or Low Ger. klump. O.E. had clympre "lump, mass of metal." The verb "to tread heavily" is first recorded 1665.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for clumped
For example, pbs with edta is also used to disengage attached and clumped cells.
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