testibrachial,a.Anat.|ˌtɛstɪˈbreɪkɪəl| [f.mod.L. testibrachi-um (f.testis testis + brachium arm) + -al1.] Of or pertaining to the testibrachium or prepeduncle of the cerebellum, being the process from the cerebellum to the testis of the brain. 1891in Cent.Dict.