torus

noun
to·​rus | \ ˈtȯr-əs How to pronounce torus (audio) \
plural tori\ ˈtȯr-​ˌī How to pronounce torus (audio) , -​ˌē \

Definition of torus

1 : a large molding of convex profile commonly occurring as the lowest molding in the base of a column
2 : the thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity
3 : a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle broadly : toroid
4 : a smooth rounded anatomical protuberance (such as a bony ridge on the skull)

Examples of torus in a Sentence

Recent Examples on the Web For example, the position and momentum of a swinging pendulum can each be represented as a point on a circle, so the phase space of a pendulum is two crossed circles, which together form a torus, or the surface of a doughnut. Quanta Magazine, 9 Dec. 2021 Surprisingly, the space of two-note chords is a Möbius strip, and the space of three-note chords is a kind of twisted triangular torus. George Hart, Scientific American, 14 Aug. 2013 To see why the local curvature of an arbitrary shape is almost never equal to its average curvature, consider a torus. Spyridon Michalakis, Scientific American, 1 Aug. 2020 Gauss-Bonnet implies that the average curvature of a torus, and of any shape with a single hole in it, is zero. Spyridon Michalakis, Scientific American, 1 Aug. 2020 As Io sweeps by Jupiter, the planet drags particles off its surface, forming a small magnetosphere, or plasma torus around the moon. Jennifer Leman, Popular Mechanics, 7 Apr. 2020 But a spherical torus like NSTX resembles a cored apple. Adrian Cho, Science | AAAS, 6 Feb. 2020 String theory and number theory have common ground in a specific kind of elliptic curve from a torus. Caroline Delbert, Popular Mechanics, 2 Mar. 2020 Moreover, in a spherical torus, several different magnet coils are crammed precariously into the narrow hole. Adrian Cho, Science | AAAS, 6 Feb. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'torus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of torus

1563, in the meaning defined at sense 1

History and Etymology for torus

New Latin, from Latin, protuberance, bulge, torus molding

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Dictionary Entries Near torus

Toruń

torus

Tory

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Last Updated

24 Dec 2021

Cite this Entry

“Torus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/torus. Accessed 20 Jan. 2022.

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More Definitions for torus

torus

noun
to·​rus | \ ˈtōr-əs, ˈtȯr- How to pronounce torus (audio) \
plural tori\ ˈtō(ə)r-​ˌī How to pronounce torus (audio) , ˈtȯ(ə)r-​ How to pronounce torus (audio) , -​ˌē \

Medical Definition of torus

1 : a doughnut-shaped surface generated by a circle rotated about an axis in its plane that does not intersect the circle
2 : a smooth rounded anatomical protuberance (as a bony ridge on the skull) a supraorbital torus

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