Describing something that widens or flares outward toward the opening or end, especially in reference to vases or architectural features.
From French 'évasé,' past participle of 'évaser' (to widen), which comes from 'é-' (out) plus 'vase' (vessel). The term entered English from French architectural and decorative arts vocabulary.
A vase that's evase—widening from a narrow base to a broader opening—is more stable and visually elegant than straight-sided alternatives, which is why potters have used this shape for thousands of years.
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