A branch is a part of a tree that extends out from the trunk and is typically characterized by its smaller size and thinner structure. The term 'branch' can also be used to refer to other objects, such as a STREAM, a CATEGORY, a PIECE, a MEMBER, or an ASSOCIATE. In terms of geography, a branch can also refer to a divergence in a river, an EXTENSION of a river, a TRIBUTARY, or a CLASSIFICATION of a river. In terms of anatomy, a branch can refer to an ARM, a LIMB, a rame, a SECT, a STEM, a TWIG, an OLIVE, a BOUGH, a PRONG, or an OFFSHOOT.