en·ceph·a·log·ra·phy (ěn-sěf'ə-lŏg'rə-fē) n.
pl.en·ceph·a·log·ra·phies Radiographic examination of the brain in which some of the cerebrospinal fluid is replaced with air or another gas that acts as a contrasting medium. en·ceph'a·lo·graph'ic (-ə-lə-grāf'ĭk, -ə-lō-) adj., en·ceph'a·lo·graph'i·cal·ly adv.