metepicœleAnat.|mɛˈtɛpɪsiːl| [f. meta- + epicœle.] The fourth ventricle of the brain. 1885[see metepencephalon].1889Wilder in Buck's Handbk.Med.Sci. VIII. 130/1 There is no evidence of the lines of division of the endyma in exposing the metepicœle (‘fourth ventricle’).