A flattish rectangular block of chocolate manufactured as an item of confectionery, usually sold individually wrapped; (also) any similarly-shaped item of confectionery that is coated or flavoured with chocolate.
Origin
Late 19th century.
Definition of chocolate bar in US English:
chocolate bar
noun
A flattish rectangular block of chocolate manufactured as an item of confectionery, usually sold individually wrapped; (also) any similarly-shaped item of confectionery that is coated or flavoured with chocolate.