n. [ Pref. post- + commisure. ] (Anat.) A transverse commisure in the posterior part of the roof of the third ventricle of the brain; the posterior cerebral commisure. B. G. Wilder. [ 1913 Webster ]
‖n.; pl.Postcornua [ NL. See Post-, and Cornu. ] (Anat.) The posterior horn of each lateral ventricle of the brain. B. G. Wilder. [ 1913 Webster ]