Bible Dictionaries
Tonometer

Webster's Dictionary

(1):

(n.) An instrument for determining the rate of vibrations in tones.

(2):

(n.) An apparatus for studying and registering the action of various fluids and drugs on the excised heart of lower animals.

(3):

(n.) An instrument for measuring tension, esp. that of the eyeball.

Bibliography Information
Webster, Noah. Entry for 'Tonometer'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tonometer.html. 1828.