Pronunciation: (tō-nom'i-tur), [key]
1. an instrument for measuring the frequencies of tones, as a tuning fork or a graduated set of tuning forks.
2. any of various physiological instruments for measuring intraocular pressure or blood pressure.
3. Physical Chem.an instrument for measuring vapor pressure.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.