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

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

clumpy, clumpish, clumplike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clump (klʌmp)
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
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]

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

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
The material in the disk will eventually clump up into nascent planets.
It also works because photons happen to be particles called bosons, which can
  all clump together in the same energy state.
Light traveling through the matter clump is warped and distorted, a phenomenon
  called gravitational lensing.
They found that salamander regeneration begins when a clump of cells called a
  blastema forms at the tip of a lost limb.
Image for clump
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