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torus

Syllabification: to·rus
Pronunciation: /ˈtôrəs
 
/

Definition of torus in English:

noun (plural tori /ˈtôrī/ or toruses)

1 Geometry A surface or solid formed by rotating a closed curve, especially a circle, around a line that lies in the same plane but does not intersect it (e.g., like a ring-shaped doughnut).
Example sentences
  • To be rigorous, the hole is not actually in the torus: the torus is the surface and the hole is in the space around the surface.
  • A small patch of a sphere or torus surface looks almost like a piece of a flat plane and has area rather than volume.
  • ‘In other words, each solution could be drawn on the surface of a torus,’ he notes.
1.1A thing of this shape, especially a large ring-shaped chamber used in physical research.
Example sentences
  • Like tokamaks, their currently more advanced cousins, stellarators use magnetic fields to confine plasma in a torus for fusion reactions.
  • This remarkable device consists of a torus of alternating magnetic materials that are chosen so that the torus has a huge net spin - 10 22 aligned electron spins - yet produces no magnetic field.
  • By carefully accounting for the particles injected into the machine and for those exhausted in the pumping system we found a deficit, indicating that a large fraction of deuterium gets trapped in the walls and components inside the torus.
2 Architecture A large convex molding, typically semicircular in cross section, especially as the lowest part of the base of a column.
Example sentences
  • One stand has a torus molding with red-painted triglyph and metopal sections, while a lower register has alternating black and white sections.
  • A long cylindrical bar of orange-painted steel evokes a tori (temple gate) and serves as a balustrade.
  • The gadrooned flattened torus moulding, shown on the shelf or footrest of the stand in the engraving also appears on the stretchers of the Blenheim stands.
3 Anatomy A ridge of bone or muscle: the maxillary torus
More example sentences
  • The supraorbital torus is lost in most modern humans, and ridging above the orbits in general is very reduced.
  • A torus, or ‘buckle,’ fracture of the distal radius is a common type of fracture in children.
  • In children, the most common injury is the torus fracture, which occurs with a fall onto an outstretched hand.
4 Botany The receptacle of a flower.

Origin

mid 16th century (sense 2): from Latin, literally 'swelling, bolster, round molding'. The other senses date from the 19th century.

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