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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
First recorded in 1910-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for spiral arm
Historical Examples
  • Xanabar lays across the spiral arm, a sprawling sphere of influence vast, mighty, solid at the core.

    History Repeats George Oliver Smith
  • Tantalus lay far out on a spiral arm, well away from the main stream of traffic that flowed through the galaxy.

    Faithfully Yours Lou Tabakow

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