Search the Dictionary

A variety of sugar obtained by the partial oxidation of mannite, and closely resembling levulose.

Iron sesquioxide in isometric form, probably a pseudomorph after magnetite.

Lead protoxide, PbO, obtained as a yellow amorphous powder, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment.

purple, violet, or lilac. Mauve aniline (Chem.), a dyestuff produced artificially by the oxidation of commercial aniline, and the first discovered of the so-called coal- tar, or aniline, dyes. It consists of the sulphate of mauveïne, and is a dark brown or bronze amorphous powder, which dissolves to a beatiful purple…

An artificial organic base, obtained by oxidizing a mixture of aniline and toluidine, and valuable for the dyestuffs it forms. [Written also mauvine.]

ertaining to, or designating, an acid which occurs in opium, and which may be obtained by oxidizing narcotine.

An earthy black oxide of copper, arising from the decomposition of other ores.

Pertaining to, or derived from, beeswax; specif., denoting an acid obtained by oxidation of myricin.

ly in combination with aluminium in the mineral mellite, and produced artificially by the oxidation of coal, graphite, etc., and hence called also graphitic acid.

An iron-black or steel-gray mineral, consisting chiefly of the oxides of iron and titanium. It is commonly massive, but occurs also in rhombohedral crystals. Called also titanic iron ore, and ilmenite.

Offensive to the smell; as, mephitic odors. Mephitic air (Chem.), carbon dioxide; -- so called because of its deadly suffocating power. See Carbonic acid, under Carbonic.

A hypothetical radical formerly supposed to exist in mesityl oxide. Mesityl oxide (Chem.), a volatile liquid having the odor of peppermint, obtained by certain dehydrating agents from acetone; -- formerly called also dumasin.

An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than acid properties, as contrasted with the nonmetals, or metalloids. No sharp line can be drawn between the metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bis…

metallic compound; specifically, the prismatic tints produced by depositing a film of peroxide of lead on polished steel by electricity.

ether CH3.O.CH3, obtained by the etherification of methyl alcohol; -- called also methyl oxide. -- Methyl green. (Chem.) See under Green, n. -- Methyl orange. (Chem.) See Helianthin. -- Methyl violet (Chem.), an artificial dye, consisting of certain methyl halogen derivatives of rosaniline.

ed as a complex ether, and having a pleasant ethereal odor. It is obtained by the partial oxidation of methyl alcohol. Called also formal.

, and is used as a substitute for borax as a blowpipe reagent in testing for the metallic oxides. Originally obtained by the alchemists from human urine, and called sal microcosmicum.

A heavy, brilliant red pigment, consisting of an oxide of lead, Pb3O4, obtained by exposing lead or massicot to a gentle and continued heat in the air. It is used as a cement, as a paint, and in the manufacture of flint glass. Called also red lead.

A pigment of a green color, the chief constituent of which is oxide of chromium.

ch the element has a higher valence, as contrasted with molybdous compounds; as, molybdic oxide.