ar·bor¹ / ˈärbər/ • n. an axle or spindle on which something revolves. ∎  a device holding a tool in a lathe.ar·bor² (Brit. ar·bour) • n. a shady garden alcove with sides and a roof formed by trees or climbing plants trained over a wooden framework.

arbor (ar-ber) n. (in anatomy) a treelike structure. a. vitae

1. the treelike outline of white matter seen in sections of the cerebellum.

2. the treelike appearance of the inner folds of the cervix (neck) of the uterus.