Flocculation, in the field of chemistry, is a process wherein colloids come out of suspension in the form of floc or flake; either spontaneously or due to the addition of a clarifying agent.
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rail noun (TRAINS) 1  B1 [ U ] the system of transport that uses trains: âº [ 2  C ] one of the two metal bars attached to the ground on which trains travel: 3  C2 [ C ] a horizontal bar fixed in position, especially to a wall or to vertical posts, used to close something off, as a support, or to hang things on: âº  to complain angrily: