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spiral arm

noun, Astronomy
any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy.
Origin of spiral arm
1910-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for spiral arm
  • Previous models had suggested that a single embedded planet would produce a spiral arm on each side of such a disk.
  • Start worrying in a few million years about a cosmic dust collision, when the sun hits the closest spiral arm of our galaxy.
  • They are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure.
  • The astronomers tried to use the measured speed of the winds from the stars compared to the actual expansion of the spiral arm.
  • It's literally billions of stars comprising our galaxies next great spiral arm across from us.

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