Etymology
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sandstone (n.)

"rock formed by consolidation of sand," 1660s, from sand (n.) + stone (n.). So called from its composition. There is an earlier, isolated use from mid-15c. in reference to some type of stone. In Britain sometimes sandrock.

updated on December 10, 2021

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Definitions of sandstone from WordNet

sandstone (n.)
a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.);
From wordnet.princeton.edu, not affiliated with etymonline.