tonometer noun. [tǝʊ'nɒmɪtǝ] E18.
[from TONO- + -METER.]
1. Music. An instrument for determining the pitch of tones; spec. a tuning-fork, or a graduated set of tuning-forks, for determining the exact frequency of vibration which produces a given tone. E18.

2. Physiology & Medicine. An instrument for measuring the pressure in the eyeball (to test for glaucoma), or that in a blood-vessel etc. L19.

■ tono'metric adjective of or pertaining to tonometry E20.

■ tonometry noun the use of a tonometer L19.

[TahlilGaran] English Dictionary ▲