Usually means: Regions of stars in galaxies.
Definitions Related words Mentions
We found 5 dictionaries that define the word spiral arm:

General (4 matching dictionaries)
  1. spiral arm: Wiktionary
  2. spiral arm: Infoplease Dictionary
  3. spiral arm: Dictionary.com
  4. Spiral arm: Wikipedia, the Free Encyclopedia

Science (1 matching dictionary)
  1. Spiral Arm: Eric Weisstein's World of Astronomy

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Definitions from Wiktionary (spiral arm)

▸ noun:  (astronomy) A section of a spiral galaxy that coils out from the centre.

Similar:
spiral galaxy, spiral nebula, Carina–Sagittarius Arm, inspiral, spiral, Orion–Cygnus Arm, spiral of Archimedes, barred spiral galaxy, Orion Arm, whirlpool galaxy, more...

Opposite:
interarm, interstellar region, void

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Similar:
spiral galaxy, spiral nebula, Carina–Sagittarius Arm, inspiral, spiral, Orion–Cygnus Arm, spiral of Archimedes, barred spiral galaxy, Orion Arm, whirlpool galaxy, more...

Opposite:
interarm, interstellar region, void



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