Migraine headaches are caused by the dilating of blood vessels in the head.

This dilating leads to migraine pain; the anti-inflammatory drug prevents release of an inflammation-triggering enzyme, according to product developers.

Hippus, also known as pupillary athetosis, is spasmodic, rhythmic, but irregular dilating and contracting pupillary movements between the sphincter and dilator muscles.

The same dilating and contracting principle informs both novels, a first-person narrator who moves between 'we all thought' and 'it was just my hunch', though the swing is greater in The Possessed and its figuration much more complex.

Similarly in certain species of animals the organ of smell is like the eye of hard-eyed animals, uncurtained, while in others which take in air it probably has a curtain over it, which is drawn back in inhalation, owing to the dilating of the veins or pores.

Do not drive for several hours after your eyes have been dilated.

They have a small mouth which can not be dilated.

Then in the rock wall on my right a new door dilated.

She showed him the key and saw his eyes dilate.

"Come in," she said, and the door dilated long enough for him to step into the room.

His eyes were dilated and he was still in shock.

It did not dilate, as he had been told to expect.

She looked up at him, and her eyes dilated with anger.

Her eyes dilated with horror at what she had done.

Suddenly the man turned on them, his plastic eyes dilating.

When we arrived at the hospital, I had dilated to seven.

The Chief did not seem to recognize him; his eyes were dilated.

And I could see that his eyes were dilated black in the dark parking lot.

These eyes, however, dilated in the face of brighter light.

His pupils were dilated and he was having a hard time sitting up.

In the dark garage his eyes were dilated solid black.

Pupils dilate when they are interested in the other person.

Her eyes were large and dark, the pupils dilated by the drugs she had been given.

The door dilated for them as they passed through to the frigid street.

Brown eyes dilated as he acknowledged several things, among them her gender.

"It is of very dramatic effect, the way he dilates his eyes."

Her nostrils dilated but she did not reach for the money.

The pupils of the eyes were not more than normally dilated.

The old man drew himself up and his nostrils dilated.

His eyes dilated all the way to black, and they had a dangerous madness in them now.