Definition of graham crackers:
(n) :
(US, by extension) A sweet rectangular cracker, usually made of graham flour and sweetened with honey (and often spiced with cinnamon) and perforated down the middle.
(n) :
(US, dated) A specific cracker made of graham flour, developed in the nineteenth century.
(n) :
Alternative letter-case form of graham cracker. [(US, dated) A specific cracker made of graham flour, developed in the nineteenth century.]