- toneA specific pitch.
- tuneA melody.
- hypotoniaA state of reduced pressure of the intraocular fluid.
- hypertoniaAn abnormal increase in tightness of muscle tone, common in cerebral palsy.
- TonianOf a geologic period within the Neoproterozoic era from about 1000 to 850 million years ago.
- tono-Tonus: muscle tone, or tension in an organ.
- tonophantA modification of the kaleidophone, for showing the composition of acoustic vibrations. It consists of two thin slips of steel welded together, their length being adjustable by a screw socket.