flocculation
    n 1: the process of flocculating; forming woolly cloudlike
         aggregations

Flocculation \Floc`cu*la"tion\, n. (Geol.)
   1. The process by which small particles of fine soils and
      sediments aggregate into larger lumps.
      [1913 Webster]

   2. The process or event in which masses of a solid substance
      of perceptible size form in a liquid by aggregation of
      smaller particles, and usually sediment to the bottom of
      the containing vessel; as, addition of a cationic polymer
      can cause flocculation of a negatively charged colloidal
      suspension.
      [PJC]