Definition of dilated
1 : marked by expansion or widening : subject to dilation Some insist that the need to learn is likely to be at the core of our dilated childhood.— Natalie Angier specifically : expanded, enlarged, or widened normally or abnormally in all dimensions dilated pupils a dilated artery/cervix Abdominal roentgenograms taken when the patient was upright showed a massively dilated stomach. — Yogesh K. Gupta
2 : expanded laterally especially : being flat and widened dilated leaves The flower corolla consists of only the upper dilated petal called the standard, or banner. — Sylvan T. Runkel and Dean M. Roose
3 : caused by dilatation (see dilatation sense 1a) dilated cardiomyopathy
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