Etymology

mudstone

M3U1D2S1T1O1N1E1

Today it means: A fine-grained sedimentary rock whose original constituents were clays or muds. Full definition →

First used 18th c.
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The story

From mud + stone.

First known use, by meaning

  • from 18th c. A fine-grained sedimentary rock whose original constituents were clays or muds.

Etymology from Wiktionary, CC BY-SA 4.0.