Tufa: alternatives and connections

A saltish concretion on reeds and grass in marshy grounds in Galatia. It is soft and porous, and was formerly used for cleansing the s…

A soft, compact stone, of a grayish, greenish, or yellowish color, carved into images by the Chinese, and hence called figure stone, a…

a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); bur…

The process of change into a stony or calcareous substance by the deposition of lime salt; -- normally, as in the formation of bone an…

Consisting of, or containing, calcareous matter or lime salts; calcareous.

Burnt sugar; a brown or black porous substance obtained by heating sugar. It is soluble in water, and is used for coloring spirits, gr…

The surface formed by cutting away the arris, or angle, formed by two faces of a piece of timber, stone, etc.

A porous earthen pot used in India for cooling water, etc.

A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argill…

A soft, whitish, coral-like stone, formed of broken shells and corals, found in the southern United States, and used for roadbeds and…

Formed of a mixture of horny and calcareous materials, as some shells and corals.

That which is deposited; matter laid or thrown down; sediment; alluvial matter; as, banks are sometimes depositions of alluvial matter.

Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may passed to cleanse it from the solid…

An extensive order of rhizopods which generally have a chambered calcareous shell formed by several united zooids. Many of them have p…

A porous earthen jar for cooling water by evaporation.

A sound formed in the throat; esp., a sound formed by the aid of the back of the tongue, much retracted, and the soft palate; also, a…

The act or process of infiltrating, as if water into a porous substance, or of a fluid into the cells of an organ or part of the body.

A contrivance for forcing feed water into a steam boiler by the direct action of the steam upon the water. The water is driven into th…