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WordNet-Online 
 Definitions from WordNet
Noun spiral galaxy has 1 sense 
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| Definitions from the WebSpiral GalaxyDefinition:A spiral galaxy refers to a type of galaxy characterized by a distinct spiral arm structure that radiates from a central core. It is one of the most common types of galaxies in the universe and includes a wide variety of shapes and sizes. Examples:Noun: 
 Adjective: 
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