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Dictionary · Word part

ton/o

A word root that means tension or pressure.

TOE-noe root

What it means

The root in words about tension, tone or pressure. Tonometry measures the pressure inside the eye, muscle tone is the slight tension of a resting muscle, and a hypertonic solution has a higher concentration, pulling water toward it.

At a glance

Also writtentono-

Related terms

glaucoma

An eye disease in which the optic nerve is damaged, usually with raised pressure inside the eye, leading to loss of vision.

hyper-

A word beginning that means above, over or more than normal.

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