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lines, and the like; especially, the art of producing such lines, etc., in the surface of metal plates or blocks of wood. Engraving is used for the decoration of the surface itself; also, for producing an original, from which a pattern or design may be printed on paper.

o involve in such complications as to render extrication a bewildering difficulty; hence, metaphorically, to insnare; to perplex; to bewilder; to puzzle; as, to entangle the feet in a net, or in briers. "Entangling alliances." Washington. The difficulties that perplex men's thoughts and entangle their understandings. L…

That which is undertaken; something attempted to be performed; a work projected which involves activity, courage, energy, and the like; a bold, arduous, or hazardous attempt; an undertaking; as, a manly enterprise; a warlike enterprise. Shak. Their hands can not perform their enterprise. Job v. 12.

The theory or science of the method or grounds of knowledge.

A religious organization of Methodist young people, founded in 1889 at Cleveland, Ohio, and taking its name from John Wesley's birthplace, Epworth, Lincolnshire, England.

these instants as noted by two observers. It is usually only a fraction of a second; -- sometimes applied loosely to differences of judgment or method occasioned by temperamental qualities of individuals. -- Theory of equations (Math.), the branch of algebra that treats of the properties of a single algebraic equation…

Something equivalent; that which is equal in value, worth, weight, or force; as, to offer an equivalent for damage done. He owned that, if the Test Act were repealed, the Protestants were entitled to some equivalent. . . . During some weeks the word equivalent, then lately imported from France, was in the mouths of all…

A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er. Atomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.

ice for measuring, or an instrument for indicating, energy expended or work done; a dynamometer. -- Er`go*met"ric (#), a.

By metonymy, the office or functions of a judge, whose state robe, lined with ermine, is emblematical of purity and honor without stain. Chatham.

A name originally given (from its red acid) to the metal vanadium. [R.]

A thin metal plate or shield to protect wood, or for ornament, as the shield around a keyhole.

A defense for the shoulder, composed of flexible overlapping plates of metal, used in the 15th century; -- the origin of the modern epaulette. Fairholt.

A composition treating of any particular subject; -- usually shorter and less methodical than a formal, finished treatise; as, an essay on the life and writings of Homer; an essay on fossils, or on commerce.

To subject to etching; to draw upon and bite with acid, as a plate of metal. I was etching a plate at the beginning of 1875. Hamerton.

ctice of engraving by means of acid which eats away lines or surfaces left unprotected in metal, glass, or the like. See Etch, v. t.

, Mixed ether (Chem.), an oxide of two different radicals in the same molecule; as, ethyl methyl ether, C2H5.O.CH3. -- Compound ether (Chem.), an ethereal salt or a salt of some hydrocarbon as the base; an ester. -- Ether engine (Mach.), a condensing engine like a steam engine, but operated by the vapor of ether inst…

An unsymmetrical, divalent, hydrocarbon radical, C2H4 metameric with ethylene but written thus, CH3.CH to distinguish it from the symmetrical ethylene, CH2.CH2. Its compounds are derived from aldehyde. Formerly called also ethidene.

A metallic mineral, a selenide of copper and silver; -- so called by Berzelius on account of its being found soon after the discovery of the metal selenium.

ed out "Eureka! eureka!" (I have found it! I have found it!), upon suddenly discovering a method of finding out how much the gold of King Hiero's crown had been alloyed. Hence, an expression of triumph concerning a discovery.