Definitions

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

  • n. 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

  • n. A sedimentary rock composed of the shells of diatoms etc

Etymologies

French, probably after Tripoli , Lebanon.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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