Something that is flecked with something is marked or covered with small bits of it. His hair was increasingly flecked with grey. = speckled Flecked is also a combining form. He was attired in a plain, mud-flecked uniform. having small marks or spots, or small pieces of something, covering a surface flecked with (Probably from flekkotr, from flekkr )
[ 'flek ] (transitive verb.) 14th century. back-formation from flecked spotted, from Middle English, probably from Old Norse flekkOttr, from flekkr spot.