1) American invention 2) Base for some pie crusts 
The graham cracker (m, m, or @m; also graham wafer) was invented in 1829 in Bound Brook, New Jersey, by Presbyterian minister Sylvester Graham. The original graham cracker was made with graham flour, a combination of finely-ground unbleached-wheat flour with the wheat bran and germ coarsely-ground and added back in providing flavor. While graham c...
(from the article `Graham, Sylvester`) American clergyman whose advocacy of a health regimen emphasizing temperance and vegetarianism found lasting expression in the graham cracker, a ...
[n] - semisweet whole-wheat cracker
noun semisweet whole-wheat cracker