blue mud

American  

noun

Geology, Oceanography.

1. a deep-sea sediment of fine silt and clay that derives its bluish color from organic material and iron sulfide.

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Etymology

Origin of blue mud

An Americanism dating back to 1830–40

Example Sentences

Beneath his painted vest, a plaster of fig leaves and caked blue mud covered the wound on his breast.

From "A Game of Thrones" by George R.R. Martin

Deftly, with a delicacy surprising in such a big man, he began to scrape away the black leaves and dried blue mud from Drogo's chest.

From "A Game of Thrones" by George R.R. Martin

A sounding gave a depth of 2400 fathoms, with a blue mud bottom.

From South: the story of Shackleton's 1914-1917 expedition by Shackleton, Ernest Henry, Sir

The latter had a delicate border of greasy blue mud.

From Gold by White, Stewart Edward

Bluemud Bay, "in most parts of the bay is a blue mud of so fine a quality that I judge it might be useful in the manufacture of earthenware."

From The Life of Captain Matthew Flinders by Scott, Ernest