| 单词 | torus |
| 释义 | Word Frequency torus(ˈtɔːrəs) nounWord forms: plural -ri (-raɪ) 1. Also called: tore a large convex moulding approximately semicircular in cross section, esp one used on the base of a classical column 2. geometry a ring-shaped surface generated by rotating a circle about a coplanar line that does not intersect the circle. Area: 4π2Rr; volume: 2π2Rr2, where r is the radius of the circle and R is the distance from the line to the centre of the circle 3. botany another name for receptacle (sense 2) 4. anatomy a ridge, fold, or similar linear elevation 5. astronomy a dense ring of gas and dust which surrounds a dying star, containing most of the star's ejected gas Word origin C16: from Latin: a swelling, of obscure origin |
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