Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A porous, lightweight, siliceous sedimentary rock composed of the shells of diatoms or radiolarians or of finely weathered chert, used as an abrasive and a polish.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A sedimentary rock composed of the shells of diatoms etc

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French, probably after Tripoli, Lebanon.]

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Examples

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