Dictionary![]() ![]() E•rid•a•nusPronunciation: (i-rid'n-us), [key] —n., —gen. -a•niPronunciation: (-n-ī"). [key] Astron. the River, a large southern constellation between Cetus and Orion, containing the bright star Achernar. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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