Akademik

clump
To form into clusters, small aggregations, or groups. [A.S. clympre, a lump]

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clump 'kləmp n a clustered mass of particles (as bacteria or blood cells) compare AGGLUTINATION
clump vi to form clumps vt to arrange in or cause to form clumps <the serum \clumps the bacteria>

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(klump) an aggregation as of bacteria caused by the action of agglutinins (agglutination).

Medical dictionary. 2011.