entasis

Noun
  1. A slight convexity in the shaft of a column;
    Compensates for the illusion of concavity that viewers experience when the sides are perfectly straight (synset 113887163)
    is a type of: convex shape, convexity - a shape that curves or bulges outward
    is a part of: column, pillar - (architecture) a tall vertical cylindrical structure standing upright and used to support a structure

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