diatomaceous earth

noun

1. a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc.

diatomaceous earth

noun

1. an unconsolidated form of diatomite Also calledkieselguhr

Word History and Origins

Origin of diatomaceous earth¹

First recorded in 1880–85

Example Sentences

Diatomaceous earth is made up of remains of minute aquatic plants.

From Project Gutenberg