/ Dictionary / Index P potometer: Meaning and Definition of Find definitions for: po•tom•e•ter Pronunciation: (pu-tom'i-tur), [key] — n. Meteorol. an instrument for measuring the amount of water that a plant loses through transpiration, consisting of a sealed vessel of water with a cutting inserted in such a way that moisture can escape only through absorption and transpiration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Potomac fever potoo Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language