hippocampal,a.Anat.|hɪpəʊˈkæmpəl| [f. hippocampus + -al1.] Belonging to the hippocampus in the brain: see hippocampus 3. 1839–47Todd Cycl.Anat. III. 294/2 The hippocampal commissure of the Wombat.1881Mivart Cat 269 The anterior end of the hippocampal gyrus.