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The Collaborative International Dictionary

Hydrous \Hy"drous\, a. [Gr. "y`dwr water.]

  1. Containing water; watery.

  2. (Chem.) Containing water of hydration or crystallization.


adj. containing combined water (especially water of crystallization as in a hydrate) [syn: hydrated] [ant: anhydrous]


Usage examples of "hydrous".

A form of gypsum, a hydrous calcium sulfate formed by the drying of bedded deposits precipitated from evaporating ancient seas.

Intricately carved from deposits of hydrous silicate of magnesia, a mineral substance formed by nature from the remains of prehistoric sea creatures, these exquisite pipes were treasured by their owners, who were fond of comparing their abilities to season them.

Ojo Caliente was constantly being reshaped and rebuilt, in places spongy, in other places cracked and hard and brittle, the stuff of geyserite: a hydrous form of silica, a variety of opal deposited in gray and white concretelike masses, porous, filamentous, and scaly.

Right in the midst of this half-sad, half-sentimental reverie, she heard a familiar voice behind her say earnestly: "And allophite is the new hydrous silicate of alumina and magnesia, much resembling pseudophite, which Websky found in Silesia.

One of the crystals it leaves behind is hydrous calcium sulfate, also known as gypsum.

The white marbles, which are derived from the recrystallization of limestone, the onyx marbles which are chemical deposits of calcium carbonate, and the green marbles which consist mainly of hydrous magnesium silicate or serpentine.

Meerschaum, or hydrous magnesium silicate, is a sedimentary rock which occurred in strata composed in part of seashells that had fused together over the ages, and when it was all gone, that was it.