torus

/'tɔ:rəs/

Thân thiện

A simple torus rests on a wooden table next to a classical column.

Definition

1. Noun:
   • A large, often semicircular, convex molding at the base of a classical column: In architecture, a "torus" is a prominent, rounded molding, typically found as the lowest element of a column base.
   • A surface or solid shaped like a ring or inner tube, generated by revolving a circle around an axis in its plane that does not intersect the circle: In geometry, a "torus" is a doughnut-shaped surface or object.

Usage Examples

• Noun (Architecture):

  • The massive stone column rested on a wide torus.
  • The design of the pedestal featured a carved torus above the plinth.

• Noun (Geometry):

  • A bagel or a life preserver has the shape of a torus.
  • The mathematician explained how a torus has a single hole, distinguishing it from a sphere.

Advanced Usage

• In Botany: In botanical contexts, "torus" can refer to the receptacle of a flower (the thickened part of a stem from which floral parts grow).

  • The torus of the flower supports the sepals, petals, stamens, and carpels.

• In Anatomy: The term is used in anatomy for certain ring-shaped structures, such as a rounded swelling.

  • The dentist noted a bony torus on the patient's palate.

Variants and Related Words

• Tori: The standard plural form of "torus."

  • The ancient ruins displayed columns with beautifully worn tori.

• Toroidal (adj): Having the shape of a torus.

  • The physicist studied the toroidal magnetic field of the fusion reactor.

Synonyms

• Molding (for the architectural sense): A shaped strip used for decoration.
• Annulus: A ring-shaped object, area, or structure. (Note: This is a close geometric concept but not an exact synonym, as an annulus is a flat ring, while a torus is three-dimensional).
• Doughnut (informal, for the geometric shape): A common analogy for the torus shape.

Related Phrases and Terms

• Torus fracture: A medical term for a specific type of bone fracture in children, where the bone buckles but does not break completely, often resembling the bump of a torus.

  • The X-ray confirmed a torus fracture of the radius.

• Algebraic torus: A concept in mathematics, specifically in algebraic geometry.

  • His research focused on the properties of an algebraic torus.

Học thuật

Noun

1. commonly the lowest molding at the base of a column
2. a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle

Từ đồng nghĩa

• tore
• toroid