blue mud
- a deep-sea sediment of fine silt and clay that derives its bluish color from organic material and iron sulfide.
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Origin of blue mud
An Americanism dating back to 1830–40
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for blue mud
Historical Examples
The north of Blue-Mud Bay has furnished also specimens of ancient sandstone; with columnar rocks, probably of clink-stone.