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dil·a·ta·tion / ˌdiləˈtāshən; ˌdī-/ • n. chiefly Med. Physiol. the process of becoming dilated. ∎  the action of dilating a vessel or opening. ∎  a dilated part of a hollow organ or vessel.

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dilatation (dilation) The process in which an applied stress leads to a state of strain involving a change in volume. The change in volume is given by: Δv = (VfVo)/Vo, where Vo is the initial volume and Vf the final volume.

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dilatation (dy-lă-tay-shŏn) n. the enlargement or expansion of a hollow organ (such as a blood vessel) or cavity.

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