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Answer for the clue "Life preserver, e.g.", 5 letters:

Alternative clues for the word torus

Doughnut, e.g.

Doughnut mathematically

Doughnut's shape

Anchor ring

Geometrical solid

Hula hoop, for one

Something ring-shaped

A ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle

Commonly the lowest molding at the base of a column

Doughnut, for one

Topologist's doughnut

Topological solid

Geometric doughnut

Convex molding

A solid shaped like a doughnut

Doughnut-shaped figure

Word definitions for torus in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Torus \To"rus\ (t[=o]"r[u^]s), n.; pl. Tori (t[=o]"r[imac]). [L., a round, swelling, or bulging place, an elevation. Cf. 3d Tore .] (Arch.) A large molding used in the bases of columns. Its profile is semicircular. See Illust. of Molding. --Brande & C....

Wiktionary Word definitions in Wiktionary
n. 1 (context topology English) A topological space which is a product of two circles. 2 (context mathematics English) The standard representation of such a space in 3-dimensional Euclidean space: a shape consisting of a ring with a circular cross-section:...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1560s, in architecture, "large, rounded molding at the base of a column," from Latin torus "a swelling, bulge, knot; cushion, couch."

WordNet Word definitions in WordNet
n. a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle [syn: toroid ] commonly the lowest molding at the base of a column [syn: tore ] [also: tori (pl)]

Wikipedia Word definitions in Wikipedia
In geometry , a torus (plural tori ) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis coplanar with the circle. If the axis of revolution does not touch the circle, the surface has a ring shape and is called...

Usage examples of torus.

In all his life he had never been anywhere as unequivocally alien as here, inside a giant torus of cold, compressed gas orbiting a black hole - itself in orbit around a brown dwarf body light years from the nearest star - its exterior studded with ships - most of them the jaggedly bulbous shapes of Affront craft - and full, in the main, of happy, space-faring Affronters and their collection of associated victim-species.

As Playday dawned, with the crowd around the torus getting thicker all the while, he snatched a pouch of moonmist and set it to his lips.

Tori Stormbird, the high, broad Kwaklahmyn cheekbones, strong jaw and cleft chin.

Then, somehow, Tori, the other, and all but three of the changers were gone.

Had the false clicks been random, they would have caused the zinc torus to wobble on its way to smelting, or recognizably wrong information about its function to have been applicable to dielectrics instead of conductors, say, which would have given the Snowflake pause and made it ask again.

Until then, she takes occasional trips to New California, a mere torus but very pleasant, or sometimes to Heaven Orleans, the "Europe of space cities," and for the time being lives in a 7 bedroom apartment in an archology in Arizona , only 33 minutes via air-taxi from Hollywood.

Looking ahead on the decametric radio bandwidths, he could see Io’s Jupiter-thick plasma torus and, at right angles to the torus, Io’s flux tube running like wide horns to Jupiter’s north and south poles.

The nutritional needs of the Memecast citizen - the Meme - were met by motile choi machines that worked intensive biofactories seeded throughout the torus.

The Zaibatsu's smallest domes were held by a profusion of pirates and privateers: the Hermes Breakaways, the Gray Torus Radicals, the Grand Megalics, the Soyuz Eclectics, and others, who changed names and personnel as easily as they cut a throat.

There was an appointment book on the secretary's burlwood desk, but she did not ask Tori if she wished to make an appointment.

The Viscous Circle as Cirl envisioned it was a tremendous swirl of color, perhaps as big as the universe, turning quickly at the center, slowly at the fringe, so that its internal structure was constantly charging while its external torus shape remained constant.

Caleb manipulated the joyball to bring up a display of a double torus contain ing two simple dosed curves.

Without a word Tori reached out, caught him by the wrist just as he was about to pluck the stone beetle off Estilo.

When Tori found him in the alley behind her apartment shot to death with his own Colt pistol, she was hardly surprised.

The new jail cell is indeed in a big scary old building somewhere in the torus of major governmental institutions that surrounds the dead hole of Intramuros.