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• n  a lengthy discussion (spoken or written) on a particular topic
• n  the act of expanding an aperture
  the dilation of the pupil of the eye

• Vacuum aspiration, as usually done, requires dilation of the cervix under local anesthesia.
• Three times as many women as men suffer from migraine headaches, a painful constriction and dilation of blood vessels in the brain often associated with the menstrual cycle, and .
• To make sure the dilation effect was not due to the small amounts of caffeine found in green tea, the group compared the arterial sizes in the green-tea drinkers with those .

• dilatation

News & Articles

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• One way the Xbox One Kinect could read your state of mind
  The Xbox One's improved Kinect will include biometric sensing capabilities -- and in this post, Jamie Madigan explains how pupil dilation could be detected to create dynamic difficulty. ...
  July 8, 2013 - Gamasutra

Quotes

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• Harold Schmidt in EurekAlert (press release)
  Free radicals contribute to the formation of arterial blockages. What's more, as the number of free radicals increases, they also interfere with the ability of the cells lining arteries to control the contraction and dilation of the arteries,...
• Tom Daschle in Socialist Worker Online
  We ban abortion; they ban a procedure,Daschle said. "They allow all the other abortive procedures available--dilation and evacuation, induction, hysterotomies, hysterectomies--those are still legally available. What we ban are all of those...