Search the Dictionary

A red or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder.

A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.

A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

rutile, sphene, etc., and isolated as an infusible iron- gray amorphous powder, having a metallic luster. It burns when heated in the air. Symbol Ti. Atomic weight 48.1.

To dry or parch, as drugs, on a metallic plate till they are friable, or are reduced to the state desired.

y one of numerous species of small tortoise-shaped beetles. Many of them have a brilliant metallic luster. the larvæ feed upon the leaves of various plants, and protect themselves beneath a mass of dried excrement held over the back by means of the caudal spines. The golden tortoise beetle (Cassida aurichalcea) is foun…

into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod.

in war and military exercises, and of great value in the orchestra. In consists of a long metallic tube, curved (once or twice) into a convenient shape, and ending in a bell. Its scale in the lower octaves is limited to the first natural harmonics; but there are modern trumpets capable, by means of valves or pistons, o…

An electric glow lamp having filaments of metallic tungsten. Such lamps, owing to the refractory nature of the metal, may be maintained at a very high temperature and require an expenditure of only about 1.25 watts per candle power.

A brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.

of the atmosphere to apply the brakes. -- Vacuum pan (Technol.), a kind of large closed metallic retort used in sugar making for boiling down sirup. It is so connected with an exhausting apparatus that a partial vacuum is formed within. This allows the evaporation and concentration to take place at a lower atmospheri…

d combined, in vanadates, in certain minerals, and reduced as an infusible, grayish-white metallic powder. It is intermediate between the metals and the non-metals, having both basic and acid properties. Sumbol V (or Vd, rarely). Atomic weight 51.2.

to the body, or part of it, in a close place; also, the place itself. (b) (Chem.) A small metallic drying oven, usually of copper, for drying and heating filter papers, precipitates, etc.; -- called also air bath. A modified form is provided with a jacket in the outside partition for holding water, or other volatile li…

A rare metallic element of which little is known. It is said by Scacchi to have been extracted from a yellowish incrustation from the cracks of a Vesuvian lava erupted in 1631.

To bring back a metal to the metallic form, as from an oxide or solution; to reduce. [Obs.]

ization. Vulcanized fiber, paper, paper pulp, or other fiber, chemically treated, as with metallic chlorides, so as to form a substance resembling ebonite in texture, hardness, etc. Knight. -- Vulcanized rubber, India rubber, vulcanized.

h or gravel, or crushed ore, with water, in order to separate the gold or other metal, or metallic ore, through their superior gravity. -- To wash the hands of. See under Hand.

The act, or the process, of gilding metallic surfaces by covering them with a thin coating of amalgam of gold, and then volatilizing the mercury by heat; -- called also wash gilding.

made by steam or gas escaping through a small orifice, or impinging against the edge of a metallic bell or cup.

A thread or slender rod of metal; a metallic substance formed to an even thread by being passed between grooved rollers, or drawn through holes in a plate of steel.