A branch, or a subtree, is a part of a (phylogenetic) tree that can be separated from the rest of the tree by removing a single edge. For example, in a tree (A, (B, (C, D))) – see the Newick format for trees – the nodes B, C, and D comprise a single branch but the nodes B and C do not. Branches are bound together by Bindefehler in the common errors method, and may be called a family.
Branch length means the same as edge length.
Fig. 1. A tree with branch (B, (C, D)).
In other languages
DE: Zweig, Unterbaum
FR: branche, sous-arbre
IT: ramo, sottografo