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Wiktionary
ringworld

n. (context scifi English) An artificial megastructure in space, consisting of a rotate ring encircling a star and having an inhabitable inner surface with gravity produced through centripetal force.

Wikipedia
Ringworld

Ringworld is a 1970 science fiction novel by Larry Niven, set in his Known Space universe and considered a classic of science fiction literature. Niven later added four sequels and four prequels. (The Fleet of Worlds series, co-written with Edward M. Lerner provides the four prequels as well as Fate of Worlds, the final sequel.) These books tie into numerous other books set in Known Space. Ringworld won the Nebula Award in 1970, as well as both the Hugo Award and Locus Award in 1971.

Ringworld (role-playing game)

The Ringworld science fiction role-playing game was published by Chaosium in 1984, using the Basic Role-Playing system for its rules and Larry Niven's Ringworld novels as a setting.

Usage examples of "ringworld".

You know we have even joined with them on various official expeditions, including some to the Ringworld artifact.

Even that force wasn’t as strong as a meteoroid moving at Ringworld speed, and Louis noted a punch hole high up on the rim wall, a few million miles antispin from the other Great Ocean.

Even that force wasn't as strong as a meteoroid moving at Ringworld speed, and Louis noted a punch hole high up on the rim wall, a few million miles antispin from the other Great Ocean.

Scrith underlies all of the terraformed and contoured inner surface of the Ringworld.

At anything over two times ten to the minus fourth power gravities of acceleration, the Ringworld would be left behind.

After they made the Ringworld from the solid residues, they'd have fuel for fusion rockets to spin it up to speed.

I can manipulate the sun's magnetic fields to pull harder on the Ringworld, and it still isn't enough.

Imagine many Ringworlds, noncoplanar, of slightly differing radii—or of widely differing radii, inhabited by very different intelligent races.

Remington agreed: his article demonstrates that I used the plot line from The Wizard of Oz$ Harry Harrison borrowed the Ringworld to make a point about population control, in Star Smashers of the Galaxy Rangers.

Okay, a lot of big Bussard ramjets on the rim walls would be enough to keep the Ringworld centered.

Huge attitude jets stand atop the rim wall, Bussard ramjets using the solar wind of protons for their fuel, to hold the Ringworld against its inherent instability.

A superconducting network embedded in the Ringworld floor generates a superthermal laser effect in a solar flare.

The grid allows magnetic manipulation of solar flares to cause a superthermal laser effect, the Ringworld meteor defense.

The fluttering webeye was below the Ringworld floor, falling into the universe.