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Inflammation of the arachnoid membrane.

A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.

See Aragonite.

A salt formed by the union of arsenious acid with a base.

The quality of being asinine; stupidity combined with obstinacy.

A lemon-yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2- 2.5. Sp. gr., 3.05-3.19.

A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges.

A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.

A fossil balanoid shell.

The act of expulsion.[Obs.] Abp. Laud.

Lydian stone, or black jasper, a variety of siliceous or flinty slate, of a grayish or bluish black color. It is employed to test the purity of gold, the amount of alloy being indicated by the color left on the stone when rubbed by the metal.

shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages. -- Bel*em*nit"ic, a.

Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

The quality of being benign; goodness; kindness; graciousness. "Benignity of aspect." Sir W. Scott.

A holy-water stoup. Shipley.

Native bismuth sulphide; -- sometimes called bismuthite.

A granular mineral of a grayish or yellowish color, found in Bolton, Massachusetts. It is a silicate of magnesium, belonging to the chrysolite family.

Beneficial, as opposed to statutory or civil; as, bonitary dominion of land.

a Mediterranea) of the Atlantic, an important and abundant food fish on the coast of the United States, and (S. Chilensis) of the Pacific, and other related species. They are large and active fishes, of a blue color with black oblique stripes.

A valuable ore of copper, containing copper, iron, and sulphur; -- also called purple copper ore (or erubescite), in allusion to the colors shown upon the slightly tarnished surface.