Dilatants are materials that increase in viscosity when subjected to shear stress.

The doctor used dilators to widen the patient's airway.

The doctor is dilating my pupils.

The dilatate pupils indicated a possible concussion.

The doctor dilatated the patient's pupils to examine them.

The dilatational properties of the material make it suitable for use in high-pressure applications.

The dilational properties of the material allow it to expand under heat.

Dilations are transformations that change the size of a figure without changing its shape.

She is dilatating her pupils with eye drops.

The doctor dilatates the patient's pupils during the eye examination.