Definition of s'more noun from the Oxford Advanced American Dictionary

 

s'more

 noun
noun
NAmE//smɔr//
 
 
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a cooked marshmallow eaten with chocolate between two graham crackers (= a type of cookie) that is traditionally cooked over a fire when camping s'mores and other campfire treats S'mores can be messy to eat.
See the Oxford Advanced Learner's Dictionary entry: s'more