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A substance which crystallizes in three distinct forms, or which has three distinct physical states; also, any one of these distinct forms. See Trimorphism, 1.

The property of crystallizing in three forms fundamentally distinct, as is the case with titanium dioxide, which crystallizes in the forms of rutile, octahedrite, and brookite. See Pleomorphism.

mbination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

o, or designating, an acid obtained from atropine and certain other alkaloids, as a white crystalline substance slightly soluble in water.

A white crystalline alkaloid, C8H15NO, produced by decomposing atropine.

in ship (Naut.), a vessel whose deck and upper works rest on two parallel hulls. -- Twin crystal. See Twin, n., 4. -- Twin flower (Bot.), a delicate evergreen plant (Linnæa borealis) of northern climates, which has pretty, fragrant, pendulous flowers borne in pairs on a slender stalk. -- Twin-screw steamer, a steam…

The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. Polysynthetic twinning, repeated twinnin…

A white crystalline nitrogenous substance present in small amount in the pancreas and spleen, and formed in large quantity from the decomposition of proteid matter by various means, -- as by pancreatic digestion, by putrefaction as of cheese, by the action of boiling acids, etc. Chemically, it consists of oxyphenol and…

A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda.

A tasteless white crystalline substance, C9H6O3, found in the bark of a certain plant (Daphne Mezereum), and also obtained by the distillation of certain gums from the Umbelliferæ, as galbanum, asafetida, etc. It is analogous to coumarin. Called also hydroxy- coumarin.

H18O2, of the propiolic acid series, obtained indirectly from undecylenic acid as a white crystalline substance.

, or designating, an acid C11H20O2, homologous with acrylic acid, and obtained as a white crystalline substance by the distillation of castor oil.

that member of the fatty acids which corresponds to undecane, and is obtained as a white crystalline substance, C11H22O2.

A very soluble crystalline body which is the chief constituent of the urine in mammals and some other animals. It is also present in small quantity in blood, serous fluids, lymph, the liver, etc.

side extracted from the leaves of a certain plant (Urechitis suberecta) as a bitter white crystalline substance.

A poisonous glucoside found accompanying urechitin, and extracted as a bitter white crystalline substance.

A white crystalline substance, NH2.CO.OC2H5, produced by the action of ammonia on ethyl carbonate. It is used somewhat in medicine as a hypnotic. By extension, any one of the series of related substances of which urethane proper is the type.

Of or pertaining to urine; obtained from urine; as, uric acid. Uric acid, a crystalline body, present in small quantity in the urine of man and most mammals. Combined in the form of urate of ammonia, it is the chief constituent of the urine of birds and reptiles, forming the white part. Traces of it are also found in t…

the nature of, urine. Urinary calculus (Med.), a concretion composed of some one or more crystalline constituents of the urine, liable to be found in any portion of the urinary passages or in the pelvis of the kidney. -- Urinary pigments, (Physiol. Chem.), certain colored substances, urochrome, or urobilin, uroerythr…