noun · 9 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
US:Recorded audio is listed in the source snapshot.
Australian, New-Zealand:/ˈtoː.ɹəs/
QueenslandRecorded audio is listed in the source snapshot.
rhymes with -ɔːɹəs
homophone: Taurus (horse–hoarse merger)
1
noun
Meaning 1
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).
A topological space which is a product of two circles.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences, topology
Examples
A 4-variable Karnaugh map can be thought of, topologically, as being a torus.
Meaning relationships
Synonyms: toroid
Antonyms: none provided
Broader terms: toroid
2
noun
Meaning 2
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).
A topological space which is a product of two circles.
The product of the specified number of circles.
Definition source: English Wiktionary via Wiktextract
Usage: in-compounds, usually
Topics: geometry, mathematics, sciences, topology
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: toroid
Antonyms: none provided
Broader terms: toroid
3
noun
Meaning 3
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).
A ring-shaped object, especially a large ring-shaped chamber used in physical research.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: toroid
Antonyms: none provided
Broader terms: toroid
4
noun
Meaning 4
A large convex molding, typically semicircular in cross section, which commonly projects at the base of a column and above the plinth.
Definition source: English Wiktionary via Wiktextract
Topics: architecture
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
A rounded ridge of bone or muscle, especially one on the occipital bone.
Definition source: English Wiktionary via Wiktextract
Topics: anatomy, medicine, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
noun
Meaning 6
The end of the peduncle or flower stalk to which the floral parts (or in the Asteraceae, the florets of a flower head) are attached.
Definition source: English Wiktionary via Wiktextract
Topics: biology, botany, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: receptacle, thalamus
Antonyms: none provided
7
noun
Meaning 7
The thickening of a membrane closing a wood-cell pit (as of gymnosperm tracheids) having the secondary cell wall arched over the pit cavity.
Definition source: English Wiktionary via Wiktextract
Topics: biology, botany, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
commonly the lowest molding at the base of a column
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: tore
Antonyms: none provided
Broader terms: molding, moulding
9
noun
Meaning 9
a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: toroid
Antonyms: none provided
Broader terms: round shape
Narrower terms: core, magnetic core
History
Etymology
Borrowed from Latin torus (“a round, swelling, elevation, protuberance”).
Across languages
Translations
64 source translations are retained for this English entry.
Albanian:
torusi
— shape in 3-dimensional Euclidean space
Arabic:
طَارَة
(ṭāra)
— shape in 3-dimensional Euclidean space
Basque:
toru
— shape in 3-dimensional Euclidean space
Belarusian:
тор
(tor)
— shape in 3-dimensional Euclidean space
Bulgarian:
тор
(tor)
— shape in 3-dimensional Euclidean space
Catalan:
tor
— shape in 3-dimensional Euclidean space
Chinese Mandarin:
環面 /环面
(huánmiàn)
— shape in 3-dimensional Euclidean space
Czech:
torus
— shape in 3-dimensional Euclidean space
Danish:
torus
— shape in 3-dimensional Euclidean space
Dutch:
torus
— shape in 3-dimensional Euclidean space
Esperanto:
toro
— shape in 3-dimensional Euclidean space
Estonian:
toor
— shape in 3-dimensional Euclidean space
Finnish:
torus
— shape in 3-dimensional Euclidean space
French:
tore
— shape in 3-dimensional Euclidean space
Galician:
toro
— shape in 3-dimensional Euclidean space
German:
Torus
— shape in 3-dimensional Euclidean space
Greek:
τόρος
(tóros)
— shape in 3-dimensional Euclidean space
Hebrew:
טורוס
(torus)
— shape in 3-dimensional Euclidean space
Hungarian:
tórusz
— shape in 3-dimensional Euclidean space
Ido:
toro
— shape in 3-dimensional Euclidean space
Italian:
toro
— shape in 3-dimensional Euclidean space
Japanese:
トーラス
(tōrasu)
— shape in 3-dimensional Euclidean space
Korean:
원환면
(wonhwanmyeon)
— shape in 3-dimensional Euclidean space
Latvian:
tors
— shape in 3-dimensional Euclidean space
Lithuanian:
toras
— shape in 3-dimensional Euclidean space
Macedonian:
тор
(tor)
— shape in 3-dimensional Euclidean space
Māori:
tarawhiti
— shape in 3-dimensional Euclidean space
Norwegian Bokmål:
torus
— shape in 3-dimensional Euclidean space
Norwegian Nynorsk:
torus
— shape in 3-dimensional Euclidean space
Polish:
torus
— shape in 3-dimensional Euclidean space
Polish:
armila
— shape in 3-dimensional Euclidean space
Portuguese:
toro
— shape in 3-dimensional Euclidean space
Romanian:
tor
— shape in 3-dimensional Euclidean space
Russian:
тор
(tor)
— shape in 3-dimensional Euclidean space
Serbo-Croatian:
торус
— shape in 3-dimensional Euclidean space
Serbo-Croatian:
torus
— shape in 3-dimensional Euclidean space
Slovak:
torus
— shape in 3-dimensional Euclidean space
Slovene:
torus
— shape in 3-dimensional Euclidean space
Spanish:
toro
— shape in 3-dimensional Euclidean space
Swedish:
torus
— shape in 3-dimensional Euclidean space
Turkish:
simit
— shape in 3-dimensional Euclidean space
Ukrainian:
тор
(tor)
— shape in 3-dimensional Euclidean space
Vietnamese:
khối xuyến
— shape in 3-dimensional Euclidean space
Chinese Mandarin:
環面 /环面
(huánmiàn)
— topological space
Esperanto:
toro
— topological space
Finnish:
torus
— topological space
French:
tore
— topological space
Japanese:
トーラス
(tōrasu)
— topological space
Polish:
torus
— topological space
Russian:
тор
(tor)
— topological space
Spanish:
toro
— topological space
Finnish:
torus
— in combination, product of circles
Polish:
torus
— in combination, product of circles
