/ Dictionary / Index P pneumoencephalogram: Meaning and Definition of Find definitions for: pneu•mo•en•ceph•a•lo•gram Pronunciation: (n"mō-en-sef'u-lu-gram", ny"-), [key] — n. Med. an encephalogram made after the replacement of the cerebrospinal fluid by air or gas, rarely used since the development of the CAT scanner. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pneumoencephalogram (Thesaurus) pneumodynamics pneumoencephalography Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language