/ Dictionary / Index C cistern barometer: Meaning and Definition of Find definitions for: cis'tern barom"eter Pronunciation: [key] a mercury barometer in which the lower mercury surface has a greater area than the upper. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cisterna cistron Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language