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drocarbons of coal tar, allied to napthalene and anthracene. It is a white crystalline substance, C18H12, of strong blue fluorescence, but generally colored yellow by impurities.

A yellow crystalline substance extracted from crude anthracene.

ived from, or resembling, chrysophane. Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin, etc.…

A warm or spicy condiment or pickle made in India, compounded of various vegetable substances, sweets, acids, etc.

The active principle of the water hemlock (Cicuta) extracted as a poisonous gummy substance.

e group of alkaloids, found especially in red cinchona bark. It is a white crystalline substance, C19H22N2O, with a bitter taste and qualities similar to, but weaker than, quinine; -- sometimes called also cinchonidia.

Like ashes; having the color of ashes, -- as the cortical substance of the brain.

to, or obtained from, cinnamon. Cinnamic acid (Chem.), a white, crystalline, odorless substance. C6H5.C2H2C2H2.CO2H, formerly obtained from storax and oil of cinnamon, now made from certain benzene derivatives in large quantities, and used for the artificial production of indigo.

A yellow crystalline substance, (C6H5.C2H2)2CO, the ketone of cinnamic acid.

having an inscription, used by the ancients for various purposes, as for indicating the distances of places, for a landmark, for sepulchral inscriptions, etc. Gwilt.

The circumference of, or distance round, any space; the measure of a line round an area. The circuit or compass of Ireland is 1,800 miles. J. Stow.

iley. Barlow. -- Circular points at infinity (Geom.), two imaginary points at infinite distance through which every circle in the plane is, in the theory of curves, imagined to pass. -- Circular polarization. (Min.) See under Polarization. -- Circular or Globular sailing (Naut.), the method of sailing by the arc of…

Attentive to all the circustances of a case or the probable consequences of an action; cautious; prudent; wary.

Attention to all the facts and circumstances of a case; caution; watchfulness. With silent circumspection, unespied. Milton.

Consisting in, or pertaining to, circumstances or particular incidents. The usual character of human testimony is substantial truth under circumstantial variety. Paley.

In respect to circumstances; not essentially; accidentally. Of the fancy and intellect, the powers are only circumstantially different. Glanvill.

To place in particular circumstances; to invest with particular accidents or adjuncts. [R.] If the act were otherwise circumstantiated, it might will that freely which now it wills reluctantly. Bramhall.

n other organs, caused by increase in the fibrous framework and decrease in the proper substance of the organ.

citric and aconitic acids. Citraconic acid (Chem.), a white, crystalline, deliquescent substance, C3H4(CO2H)2, obtained by distillation of citric acid. It is a compound of the ethylene series.

OH.(CO2H)3, extracted from lemons, currants, gooseberies, etc., as a white crystalline substance, having a pleasant sour taste.