Real Dictionary

carob
The dark-brown fruit of the carob tree can be referred to as carob. It is often made into powder and used instead of chocolate.
variable noun: A carob or carob tree is a Mediterranean tree that stays green all year round. It has dark-brown fruit that tastes similar to chocolate.

carob in American English
a leguminous tree (Ceratonia siliqua) of the E Mediterranean, bearing long, flat, leathery, brown pods with a sweet pulp
noun: a Mediterranean tree, Ceratonia siliqua, of the legume family, bearing long, leathery pods containing hard seeds and sweet, edible pulp

carob in British English
noun: an evergreen leguminous Mediterranean tree, Ceratonia siliqua, with compound leaves and edible pods