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Halogen :: Halogen (n.) An electro-negative element or radical, which, by combination with a metal, forms a haloid salt; especially, chlorine, bromine, and iodine; sometimes, also, fluorine and cyanogen. See Chlorine family, under Chlorine..

Tolylene :: Tolylene (n.) A hydrocarbon radical, C6H4.(CH2)2, regarded as characteristic of certain toluene derivatives..

Radical :: Radical (n.) Specifically, a group of two or more atoms, not completely saturated, which are so linked that their union implies certain properties, and are conveniently regarded as playing the part of a single atom; a residue; -- called also a compound radical. Cf. Residue..

Synthesis :: Synthesis (n.) The art or process of making a compound by putting the ingredients together, as contrasted with analysis; thus, water is made by synthesis from hydrogen and oxygen; hence, specifically, the building up of complex compounds by special reactions, whereby their component radicals are so grouped that the resulting substances are identical in every respect with the natural articles when such occur; thus, artificial alcohol, urea, indigo blue, alizarin, etc., are made by synthesis..

Mesityl :: Mesityl (n.) A hypothetical radical formerly supposed to exist in mesityl oxide.

Sulphonic :: Sulphone (n.) Any one of a series of compounds analogous to the ketones, and consisting of the sulphuryl group united with two hydrocarbon radicals; as, dimethyl sulphone, (CH/)/.SO/..

Plantain :: Plantain (n.) Any plant of the genus Plantago, but especially the P. major, a low herb with broad spreading radical leaves, and slender spikes of minute flowers. It is a native of Europe, but now found near the abode of civilized man in nearly all parts of the world..

Conjugate :: Conjugate (a.) Containing two or more radicals supposed to act the part of a single one.

Azo- :: Azo- () Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene, azobenzoic, etc. These compounds furnish many artificial dyes. See Diazo-..

Amyl :: Amyl (n.) A hydrocarbon radical, C5H11, of the paraffine series found in amyl alcohol or fusel oil, etc..

Met- :: Met- () That two replacing radicals, in the benzene nucleus, occupy the relative positions of 1 and 3, 2 and 4, 3 and 5, 4 and 6, 5 and 1, or 6 and 2; as, metacresol, etc. See Ortho-, and Para-..

Formative :: Formative (n.) That which serves merely to give form, and is no part of the radical, as the prefix or the termination of a word..

Ethenyl :: Ethenyl (n.) A trivalent hydrocarbon radical, CH3.C..

Antimonite :: Antimonite (n.) A compound of antimonious acid and a base or basic radical.

Nitro- :: Nitro- () A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene..

Ketone :: Ketone (n.) One of a large class of organic substances resembling the aldehydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor..

Heptyl :: Heptyl (n.) A compound radical, C7H15, regarded as the essential radical of heptane and a related series of compounds..

Sticcado :: Stibonium (n.) The hypothetical radical SbH4, analogous to ammonium; -- called also antimonium..

Phosphonium :: Phosphonium (n.) The hypothetical radical PH4, analogous to ammonium, and regarded as the nucleus of certain derivatives of phosphine..

Red-hot :: Red-hot (a.) Red with heat; heated to redness; as, red-hot iron; red-hot balls. Hence, figuratively, excited; violent; as, a red-hot radical..

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