Aerobrake: To shed velocity by passing through a planetary atmosphere.

Antispin: Direction opposite the Ringworlds direction of spin.

Arch: The Ringworld as seen from anywhere on its surface.

ARM: Once the Amalgamation of Regional Militia; for several hundred years, the United Nations armed forces. Jurisdiction was originally limited to Earth-Moon system.

Autodoc: Any system built to perform automated medical operations.

Belter: Citizen of the asteroid belt, Sol system.

Canyon: A world of human space, once Patriarchy property.

Carlos Wus autodoc: An experimental medical system first seen in "Procrustes".

Droud: A small device that plugs into the skull of a current addict. Its purpose: to meter a current flow to the pleasure center of the users brain.

Elbow root: A ubiquitous Ringworld plant. Grows as a kind of natural fence.

Experimentalist: A Piersons puppeteer political faction now out of power.

Eyestorm: The pattern of winds that forms above a puncture in the Ringworld floor. A tornado on its side. (Hurricanes and tornadoes are impossible on the Ringworlds flat surface.)

Fleet of Worlds: The homeworld of the Piersons puppeteer species, and four more worlds sequestered for farming, all occupy a Kemplerer rosette moving at near lightspeed.

Flup: Seabottom ooze.

Flycycle: A one- or two-LE flying device.

Fringe War: All the spacegoing species of known space seem to have sent ships to Ringworld system. Bram, when he was in command of the Repair Center, shot them down if they approached too close. Tunesmith hasnt done that, and the Fringe War is currently in a cold state.