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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.
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Word History and Origins
Origin of spiral arm1
First recorded in 1910–15
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Example Sentences
Tantalus lay far out on a spiral arm, well away from the main stream of traffic that flowed through the galaxy.
From Project Gutenberg
Xanabar lays across the Spiral Arm, a sprawling sphere of influence vast, mighty, solid at the core.
From Project Gutenberg
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