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Define :: Define (v. t.) To determine the precise signification of; to fix the meaning of; to describe accurately; to explain; to expound or interpret; as, to define a word, a phrase, or a scientific term..

Hydrazine :: Hydrazine (n.) Any one of a series of nitrogenous bases, resembling the amines and produced by the reduction of certain nitroso and diazo compounds; as, methyl hydrazine, phenyl hydrazine, etc. They are derivatives of hydrazine proper, H2N.NH2, which is a doubled amido group, recently (1887) isolated as a stable, colorless gas, with a peculiar, irritating odor. As a base it forms distinct salts. Called also diamide, amidogen, (or more properly diamidogen), etc..

Hardness :: Hardness (n.) The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes..

Pyrosome :: Pyrosome (n.) Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent..

Quintal :: Quintal (n.) A hundredweight, either 112 or 100 pounds, according to the scale used. Cf. Cental..

Chloride :: Chloride (n.) A binary compound of chlorine with another element or radical; as, chloride of sodium (common salt)..

Polymeniscous :: Polymeniscous (a.) Having numerous facets; -- said of the compound eyes of insects and crustaceans.

Impoundage :: Impoundage (n.) The act of impounding, or the state of being impounded..

Vinyl :: Vinyl (n.) The hypothetical radical C2H3, regarded as the characteristic residue of ethylene and that related series of unsaturated hydrocarbons with which the allyl compounds are homologous..

Thallic :: Thallic (a.) Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a higher valence as contrasted with the thallous compounds; as, thallic oxide..

Alkermes :: Alkermes (n.) A compound cordial, in the form of a confection, deriving its name from the kermes insect, its principal ingredient..

Pearlash :: Pearlash (n.) A white amorphous or granular substance which consists principally of potassium carbonate, and has a strong alkaline reaction. It is obtained by lixiviating wood ashes, and evaporating the lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc..

Assayer :: Assayer (n.) One who assays. Specifically: One who examines metallic ores or compounds, for the purpose of determining the amount of any particular metal in the same, especially of gold or silver..

Catalysis :: Catalysis (n.) A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of soluble ferments (as diastase, or ptyali

Tin :: Tin (n.) An elementary substance found as an oxide in the mineral cassiterite, and reduced as a soft white crystalline metal, malleable at ordinary temperatures, but brittle when heated. It is not easily oxidized in the air, and is used chiefly to coat iron to protect it from rusting, in the form of tin foil with mercury to form the reflective surface of mirrors, and in solder, bronze, speculum metal, and other alloys. Its compounds are designated as stannous, or stannic. Symbol Sn (Stannum). At

Enhance :: Enhance (v. i.) To be raised up; to grow larger; as, a debt enhances rapidly by compound interest..

Iridious :: Iridious (a.) Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.

Argentous :: Argentous (a.) Of, pertaining to, or containing, silver; -- said of certain silver compounds in which silver has a higher proportion than in argentic compounds; as, argentous chloride..

Propound :: Propound (v. t.) To offer for consideration; to exhibit; to propose; as, to propound a question; to propound an argument..

Halibut :: Halibut (n.) A large, northern, marine flatfish (Hippoglossus vulgaris), of the family Pleuronectidae. It often grows very large, weighing more than three hundred pounds. It is an important food fish..

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