dilatation
US /ˌdɪl.əˈteɪ.ʃən/
UK /ˌdɪl.əˈteɪ.ʃən/
1.
sự giãn nở
the process of becoming wider or more open, or the act of making something do this:
:
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Dilatation of blood vessels is always associated with increased blood flow and increased blood pressure.