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A powerful alkaloid, C17H21NO4, obtained from the leaves of coca. It is a bitter, white, crystalline substance, and is remarkable for producing local insensibility to pain.

An oblong case in which the silkworn lies in its chrysalis state. It is formed of threads of silk spun by the worm just before leaving the larval state. From these the silk of commerce is prepared.

One of the opium alkaloids; a white crystalline substance, C18H21NO3, similar to and regarded as a derivative of morphine, but much feebler in its action; -- called also codeia.

A bluish violet, crystalline substance obtained in the purification of crude wood vinegar. It is regarded as a complex quinone derivative of diphenyl; -- called also cedriret.

A hydrous borate of lime occurring in transparent colorless or white crystals, also massive, in Southern California.

A substance (as albumin, gum, gelatin, etc.) which is of a gelatinous rather than a crystalline nature, and which diffuses itself through animal membranes or vegetable parchment more slowly than crystalloids do; -- opposed to crystalloid.

The active medicinal principle of colocynth; a bitter, yellow, crystalline substance, regarded as a glucoside.

A white, crystalline, bitter substance. See Calumbin.

ly or firmly united, as the particles of solid bodies; firm; close; solid; dense. Glass, crystal, gems, and other compact bodies. Sir I. Newton.

To divide; to mark out into parts or subdivisions. [R.] The crystal surface is comparted all In niches verged with rubies. Glover.

agreement for composition between a debtor and several creditors. -- Composition plane (Crystallog.), the plane by which the two individuals of a twin crystal are united in their reserved positions. -- Composition of forces (Mech.), the finding of a single force (called the resultant) which shall be equal in effect t…

, division (Arith.), the addition, substraction, etc., of compound numbers. -- Compound crystal (Crystallog.), a twin crystal, or one seeming to be made up of two or more crystals combined according to regular laws of composition. -- Compound engine (Mech.), a form of steam engine in which the steam that has been use…

table alkaloid found with conine in the poison hemlock (Conium maculatum). It is a white crystalline substance, C8H17NO, easily convertible into conine.

A glucoside extracted from the cambium layer of coniferous trees as a white crystalline substance.

A white, crystalline, poisonous substance, regarded as a glucoside, extracted from the lily of the valley (Convallaria Majalis). Its taste is first bitter, then sweet.

A white, crystalline glucoside, of an irritating taste, extracted from the convallaria or lily of the valley.

Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.

giving strength or spirits. Behold this cordial julep here That flames and dances in his crystal bounds. Milton.

A bitter principle obtained from dogwood (Cornus florida), as a white crystalline substance; -- called also cornic acid.

irritating action on the body tissue. Usually it is in the form of a heavy, transparent, crystalline substance, easily soluble, and of an acrid, burning taste. It is a virulent poison, a powerful antiseptic, and an exellent antisyphilitic; called also mercuric bichloride. It is to be carefully distinguished from calome…