Usually means: Nuclear reactor using fast neutrons.
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We found 11 dictionaries that define the word fast reactor:

General (10 matching dictionaries)
  1. fast reactor: Oxford Learner's Dictionaries
  2. fast reactor: Collins English Dictionary
  3. fast reactor: Vocabulary.com
  4. fast reactor: Dictionary.com
  5. Fast reactor: Wikipedia, the Free Encyclopedia
  6. fast reactor: Rhymezone
  7. fast reactor: FreeDictionary.org
  8. fast reactor: Mnemonic Dictionary
  9. fast reactor: TheFreeDictionary.com
  10. fast reactor: Wiktionary

Computing (1 matching dictionary)
  1. fast reactor: Encyclopedia

(Note: See fast_reactors as well.)

Definitions from Wiktionary (fast reactor)

noun:  (nuclear physics, engineering) A nuclear reactor with no moderator, using fast neutrons directly in a controlled fission chain reaction without slowing them down, allowing for a much more compact reactor which uses fissile material much more efficiently and generates larger quantities of high-energy neutrons which can be used for breeding more fissile material or producing other useful radioactive nuclides, but requiring the use of highly-enriched uranium (at least 20% uranium-235) or other fuel containing a similarly high concentration of fissile material.

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