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pupillary dilation due to contraction of the dilator muscle of the pupil induced by adrenergic drugs or by stimulation of the sympathetic pathway.
Farlex Partner Medical Dictionary © Farlex 2012
Mydriasis resulting from overactivity of the dilator muscle of the iris or of sympathetic nerves supplying that muscle.
See also: mydriasis
Medical Dictionary, © 2009 Farlex and Partners