Usually means: Rare, non-radioactive helium isotope.
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We found 8 dictionaries that define the word helium-3:

General (5 matching dictionaries)
  1. helium-3: Merriam-Webster
  2. Helium-3, helium-3: Wordnik
  3. helium-3: Wiktionary
  4. helium-3: Dictionary.com
  5. Helium-3: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. helium-3: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. Helium-3: Eric Weisstein's World of Astronomy

Definitions from Wiktionary (helium-3)

noun:  (physics) The rare isotope of helium, ³₂He, that has a single neutron.

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