Usually means: Artificial, circular habitat encircling star.
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We found 4 dictionaries that define the word ringworld:

General (3 matching dictionaries)
  1. Ringworld: Wordnik
  2. ringworld: Wiktionary
  3. Ringworld (RPG), Ringworld (role-playing game), Ringworld: Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)
  1. ringworld: Glossary of Science Fiction Jargon

Definitions from Wiktionary (ringworld)

noun:  (science fiction) An artificial megastructure in space, consisting of a rotating ring encircling a star and having an inhabitable inner surface with gravity produced through centripetal force.

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