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An instrument for measuring the dilatation or expansion of a substance, especially of a fluid.

Either one of the two forms of a dimorphous substance; as, calcite and aragonite are dimorphs.

A white, crystalline, nitrogenous substance obtained by the reduction of isatin. It is a member of the indol series; -- hence its name.

the action of plunging some receptacle, as a dipper, ladle. etc.; into a liquid or a soft substance and removing a part. Whoever dips too deep will find death in the pot. L'Estrange.

A white crystalline substance, C6H5.C6H5, obtained by leading benzene through a heated iron tube. It consists of two benzene or phenyl radicals united.

The soft, spongy, or cancellated substance between the plates of the skull.

Partaking of the nature of two bodies; producing two substances. Wright.

Any foul of filthy substance, as excrement, mud, dust, etc.; whatever, adhering to anything, renders it foul or unclean; earth; as, a wagonload of dirt. Whose waters cast up mire and dirt. Is. lvii. 20.

A white amorphous substance obtained as a polymeric modification of acrolein.

The decomposition of complex substances, within the organism, into simpler ones suitable only for excretion, with evolution of energy, -- a normal nutritional process the reverse of assimilation; downward metabolism. The breaking down of already existing chemical compounds into simpler ones, sometimes called disassimil…

effect of a material in separating the different rays of light by refraction, as when the substance is formed into a prism. -- Dis*pers"ive*ness, n.

The process of extracting soluble substances from organic material and the like, whereby a quantity of saturated solvent is displaced, or removed, for another quantity of the solvent. Piston displacement (Mech.), the volume of the space swept through, or weight of steam, water, etc., displaced, in a given time, by the…

Occurring in small portions scattered through some other substance.

llowship or union; to disunite; to disjoin; as, to dissociate the particles of a concrete substance. Before Wyclif's death in 1384, John of Gaunt had openly dissociated himself from the reformer. A. W. Ward.

o simpler constituents; -- said particularly of the action of heat on gaseous or volatile substances; as, the dissociation of the sulphur molecules; the dissociation of ammonium chloride into hydrochloric acid and ammonia.

That which has the power of dissolving or melting other substances, esp. by mixture with them; a menstruum; a solvent. Melted in the crucible dissolvents. A. Smith. The secret treaty of December acted as an immediate dissolvent to the truce. Mothley.

The separation of the volatile parts of a substance from the more fixed; specifically, the operation of driving off gas or vapor from volatile liquids or solids, by heat in a retort or still, and the condensation of the products as far as possible by a cool receiver, alembic, or condenser; rectification; vaporization;…

Distillation; the substance obtained by distillation. [Obs.] Shak.

ining two equivalents of sulphur; as, dithionic acid. Dithionic acid (Chem.), an unstable substance, H2S2O6, known only in its solutions, and in certain well-defined salts.

One of a series of complex nitrogenous substances regarded as containing two molecules of urea or their radicals, as uric acid or allantoin. Cf. Ureide.