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regarded as benzene with four CH groups replaced by nitrogen atoms; also, any of various derivatives of the same. There are three isomeric varieties.

A combining form (also used adjectively), designating any one of a series of double derivatives of the azo and diazo compounds containing four atoms of nitrogen.

regarded as pyrrol in which nitrogen atoms replace three CH groups; also, any of various derivatives of the same.

A ketone derivative of thiophene obtained as a white crystalline substance, (C4H3S)2.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.

thetical radical C4H3S, regarded as the essential residue of thiophene and certain of its derivatives.

phene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives. [Written also thionaphtene.]

An artificial red or violet dyestuff consisting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet.

he base of a large number of substances which closely resemble the corresponding aromatic derivatives.

Any one of three possible metameric substances, which are dimethyl derivatives of thiophene, like the xylenes from benzene.

A phenol derivative of cymene, C10H13.OH, isomeric with carvacrol, found in oil of thyme, and extracted as a white crystalline substance of a pleasant aromatic odor and strong antiseptic properties; -- called also hydroxy cymene.

water as the tide moves. That of the ocean is called primitive; that of bays or channels derivative. Whewell. -- Tide wheel, a water wheel so constructed as to be moved by the ebb or flow of the tide.

A complex double tolyl and toluidine derivative of glycocoll, obtained as a white crystalline substance.

Any one of three metameric amido derivatives of toluene analogous to aniline, and called respectively orthtoluidine, metatoluidine, and paratoluidine; especially, the commonest one, or paratoluidine, which is obtained as a white crystalline substance.

designating, any one of three isomeric crystalline acids, C9H10ON.CO2H, which are toluyl derivatives of glycocoll.

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

Effected by transference of signification. By far the greater part of the transitive or derivative applications of words depend on casual and unaccountable caprices of the feelings or the fancy. Stewart.

series of orange-red dyestuffs produced artificially from certain complex sulphonic acid derivatives of azo and diazo hydrocarbons of the aromatic series; -- so called because of the general resemblance to the shades of nasturtium (Tropæolum).

nd amidopropionic acid, and by decomposition yields oxybenzoic acid, or some other benzol derivative. [Written also tyrosine.]

Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides. [Written also ureid.]

The acid amide derivative of valeric acid, obtained as a white crystalline substance.