Definition

1. Noun:
   • A slight convex curve in the shaft of a column: In classical architecture, "entasis" refers to the intentional, subtle swelling or outward curvature applied to the vertical profile of a column. This optical refinement compensates for the visual illusion of concavity that occurs when the sides of a tall, straight column are perceived by the human eye.

Examples of Usage

• Noun:
  • The Parthenon's columns are a famous example of the use of entasis to achieve perfect visual harmony.
  • The architect specified a precise degree of entasis for the new museum's neoclassical facade.
  • Without entasis, the column would appear to curve inward to a viewer standing at its base.

Advanced Usage

• Technical Application: Entasis is a calculated architectural feature, not a decorative element. Its purpose is purely optical correction.
  • The entasis was calculated to be most pronounced at about one-third of the column's height.

Variants and Related Words

• Entatic (adj): Pertaining to or having the characteristic of entasis.
  • The entatic curve is almost imperceptible but essential to the design.

Synonyms

• Convexity: The state of being curved or rounded outward. (This is a general term, while "entasis" is specific to columnar architecture.)
• Swelling: A bulging shape. (Used descriptively in an architectural context.)

Related Terms (Architectural Context)

• Shaft: The tall, cylindrical body of a column between the base and the capital.
• Refinement: A subtle adjustment made to a structure to correct optical illusions, with entasis being a primary example.
• Classical Order: A style of classical architecture (Doric, Ionic, Corinthian) that often employs entasis, particularly in the Doric order.

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