Webster's English Dictionary

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agglutination

ag.glu.ti.na.tion \*-.glu:t-*n-'a--sh*n\ n 1: the action or process of 
   agglutinating  2: a mass or group formed by the union of separate elements  
   3: the formation of derivative or compound words by putting together 
   constituents of which each expresses a single definite meaning 4: a reaction in 
   which particles (as red blood cells or bacteria) suspended  in a liquid 
   collect into clumps and which occurs esp. as a serologic response to a 
   specific antibody