
1) Architectural curve 2) Convex shape 3) Convexity
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https://www.crosswordclues.com/clue/entasis

In architecture, entasis is the application of a convex curve to a surface for aesthetic purposes. Its best-known use is in certain orders of Classical columns that curve slightly as their diameter is decreased from the bottom upwards. In the Hellenistic period some columns with entasis are cylindrical in their lower parts. Some Roman columns are ...
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http://en.wikipedia.org/wiki/Entasis
[company] ==History== Entasis was founded by Christian and Signe Cold in 1996. Their first building, a new main entrance for Copenhagen Zoo, was awarded the AIA Prize `Best Building in Europe 1998`. In 2007 the firm won the high-profile open international competition for the redevelopment of the former Carlsberg brewery site in Copenhagen, ...
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http://en.wikipedia.org/wiki/Entasis_(company)

swelling on vertical columns to counteract optical illusion of concavity
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http://phrontistery.info/e.html

• (n.) Same as Entasia. • (n.) A slight convex swelling of the shaft of a column.
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http://thinkexist.com/dictionary/meaning/entasis/

in architecture, the convex curve given to a column, spire, or similar upright member, in an attempt to correct the optical illusion of hollowness or ... [2 related articles]
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http://www.britannica.com/eb/a-z/e/33

a slightly convex profile used originally by the Greeks (in columns) to counteract the impression of concavity produced by parallel lines
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http://www.encyclo.co.uk/local/20559

very slight convex curve put on columns and sometimes other structures such as spires to prevent the optical illusion of them appearing concave, ie, bending outwards.
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http://www.encyclo.co.uk/local/20935

In classical architecture, the slight swelling or bulge in the center of a column, which corrects the illusion of concave tapering produced by parallel straight lines.
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http://www.encyclo.co.uk/local/21532

The swelling in a column from the lower end to a certain point
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http://www.encyclo.co.uk/visitor-contributions.php
En'ta·sis noun [ New Latin , from Greek ... a stretching; from ...; ... in + ... to extend.]
1. (Architecture) A slight convex swelling of the shaft of a column.
2. (Medicine) Same as
Entasia .
Found on
http://www.encyclo.co.uk/webster/E/47

In architecture, an entasis is a slight convex swelling of the shaft of a column. Entasis is deliberately introduced into columns to correct the optical illusion whereby the columns appear to be concave. Entasis is to be found in almost all the Grecian examples.
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http://www.probertencyclopaedia.com/browse/TE.HTM

The curve resulting from the gradual diminishing in the diameter of the upper two-thirds of a column.
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http://www.selectstone.com/architectural-resources/stone-glossary/
noun a slight convexity in the shaft of a column; compensates for the illusion of concavity that viewers experience when the sides are perfectly straight
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https://www.encyclo.co.uk/local/20974

a slight convexity given to a column or tower, as to correct an optical illusion.
Found on
https://www.infoplease.com/dictionary/entasis
No exact match found.