/ Dictionary / Index S spirometer: Meaning and Definition of Find definitions for: spi•rom•e•ter Pronunciation: (spī-rom'i-tur), [key] — n. an instrument for determining the capacity of the lungs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spirometer (Thesaurus) spiroid spironolactone Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language