Word Study
poster child
WORDNET DICTIONARY
Noun poster child has 1 sense
- poster child(n = noun.person) Array - a child afflicted by some disease or deformity whose picture is used on posters to raise money for charitable purposes; "she was the poster child for muscular dystrophy" is a kind of child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster
has particulars: poster boy, poster girl
For further exploring for "poster child" in Webster Dictionary Online