en·ta·sis /ˈɛntəsɪs/
圓柱收分曲線,酒壺式的構造
En·ta·sis n.
1. Arch. A slight convex swelling of the shaft of a column.
2. Med. Same as Entasia.
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entasis
n : a slight convexity in the shaft of a column; compensates for
the illusion of concavity that viewers experience when
the sides are perfectly straight
[also: entases (pl)]