maculation

from WordNet (r) 3.0 (2006)

maculation
    n 1: a small contrasting part of something; "a bald spot"; "a
         leopard's spots"; "a patch of clouds"; "patches of thin
         ice"; "a fleck of red" [syn: {spot}, {speckle}, {dapple},
         {patch}, {fleck}, {maculation}]
    2: the act of spotting or staining something [syn: {staining},
       {spotting}, {maculation}]

from The Collaborative International Dictionary of English v.0.48

Maculation \Mac"u*la"tion\, n. [L. maculatio.]
   The act of spotting; a spot; a blemish; a macula. --Shak.
   [1913 Webster]