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. [ Pref. post- + communion. ] 1. (Ch. of Eng. & Prot. Epis. Ch.) The concluding portion of the communion service. [ 1913 Webster ]

2. (R. C. Ch.) A prayer or prayers which the priest says at Mass, after the ablutions. [ 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 ]