Merriam-Webster's Collegiate® Dictionary, 11th Edition
FLECK
I. transitive verb
Etymology: back-formation from flecked spotted, from Middle English; akin to Old High German flec spot, Old Norse flekkr
Date: 14th century
streak , spot , to color as if by sprinkling with flecks ,
II. noun
Date: 1598
spot , mark , flake , particle