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A white, nitrogenous, crystallizable substance, C4H8N2O3+H2O, found in many plants, and first obtained from asparagus. It is believed to aid in the disposition of nitrogenous matter throughout the plant; -- called also altheine.

A white crystalline compound of acetyl and salicylic acid used as a drug for the salicylic acid liberated from it in the intestines.

An optical property of some crystals which exhibit a star- shaped by reflected light, as star sapphire, or by transmitted light, as some mica.

An oxychloride of copper, usually in emerald-green prismatic crystals.

A poisonous, white, crystallizable alkaloid, extracted from the Atropa belladonna, or deadly nightshade, and the Datura Stramonium, or thorn apple. It is remarkable for its power in dilating the pupil of the eye. Called also daturine.

A hydrous carbonate of copper and zinc, found in pale green or blue crystalline aggregations. It yields a kind of brass on reduction.

iginal or authority, in opposition to that which is false, fictitious, counterfeit, or apocryphal; being what it purports to be; genuine; not of doubtful origin; real; as, an authentic paper or register. To be avenged On him who had stole Jove's authentic fire. Milton.

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 crystalline globulin, contained in oat kernels, very similar in composition to excelsin, but different in reactions and crystalline form.

a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone.

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

e of several imaginary lines, assumed in describing the position of the planes by which a crystal is bounded.

A substance (C6H5.N2.C6H5) derived from nitrobenzene, forming orange red crystals which are easily fusible.

To cry baa, or bleat as a sheep. He treble baas for help, but none can get. Sir P. Sidney.

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.

t., May you live ten thousand years; -- used in salutation of the emperor and as a battle cry. [Japan]

A white, crystalline substance,

Native sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins.…

A mineral of a white or gray color, occurring massive or crystallized. It is a compound of the carbonates of barium and calcium.

Relating to, or forming, the base. Basal cleavage. See under Cleavage. -- Basal plane (Crystallog.), one parallel to the lateral or horizontal axis.