torus

Definition

The standard representation of such a space in 3-dimensional Euclidean space: a surface or solid formed by rotating a closed curve, especially a circle, about a line which lies in the same plane but does not intersect it (e.g. like a ring doughnut).

Etymology

Borrowed from Latin torus (“a round, swelling, elevation, protuberance”).

Example Sentences

• "A 4-variable Karnaugh map can be thought of, topologically, as being a torus."
• "While there is a hereditary component to tori, this does not explain all cases. Tori tend to appear more frequently during middle age of life; the torus palatinus is more commonly observed in females, but this is not the case with the torus mandibularis. Certain ethnic groups are more prone to one torus or the other."

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