An irregularly shaped spot, stain, or colored or discolored area: "spectacular splotches of color and beauty in the blossoms” ( Wendy Lyon Moonan).
To mark with splotches or a splotch.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.