Arborize is a word that means to branch out in a treelike manner or to cause something to do so. Some synonyms for arborize include ramify, bifurcate, divide, spread, extend, fork, and branch off. These words are often used to describe the growth of plants, the spread of electrical signals in the brain or nervous system, or the branching of roads and highways. In addition to these specific contexts, these words can also be used more broadly to describe any process that involves branching out or spreading. Regardless of the context, the synonyms for arborize convey the idea of expansion and growth in a visually interesting and dynamic way.