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A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives.

A hypothetical compound, C2H2N4 which may be 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 hypothetical hydrocarbon, C4H4, analogous to benzene; -- so called from the four carbon atoms in the molecule. Tetrol phenol, furfuran. [Obs.]

A salt of a hypothetical thallic acid.

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

The hypothetical radical SO, regarded as an essential constituent of certain sulphurous compounds; as, thionyl chloride.

Any one of the three hypothetical radicals corresponding to the three toluic acids.

ygen, C5H4N4O3, and by decomposition yields urea, among other products. It can be made synthetically by heating together urea and glycocoll. It was formerly called also lithic acid, in allusion to its occurrence in stone, or calculus.

The hypothetical radical C5H9O, regarded as the essential nucleus of certain valeric acid derivatives.

The hypothetical radical VO, regarded as a characterized residue of certain vanadium compounds.

The hypothetical radical characteristic of vanillic alcohol.

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.

g catgut strings upon, and brass or steel wires under, the keyboard. These, sounding sympathetically with the strings, yield a peculiarly soft and silvery sound. It is now seldom used.

application; -- sometimes called virtual work. -- Virtual velocity (Mech.), a minute hypothetical displacement, assumed in analysis to facilitate the investigation of statical problems. With respect to any given force of a number of forces holding a material system in equilibrium, it is the projection, upon the direct…

ing to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structure of the chemical atom. -- Vortex wheel, a kind of tur…

The hypothetical radical supposed to be characteristic of xanthic acid. [Archaic]