diatomaceous earth, kieselguhr, or a similar material.

= fossil flour n.

Used, with qualifying adjectives, to form the names of medicinal and other earths, boles, and the like… tripoli or rotten-stone.

An earth composed of the siliceous remains of diatoms, used as an absorbent of nitroglycerine in the manufacture of dynamite; diatomite.

Diatomaceous or infusorial earth.

A kind of diatomaceous earth found in Denmark and used elsewhere as a building material for its lightness and heat resistance.