chemical


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chemical

any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use

chemical

[′kem·i·kəl]
(chemistry)
Related to the science of chemistry.
A substance characterized by definite molecular composition.
References in classic literature ?
Directly afterwards the distant sound of a heavy weight falling on the ground was heard, but no one paid any attention to it; the nurse was engaged in watching the chemical analysis, and Villefort was still absorbed in grief.
This nerve-force, stored in the brain, would probably be traceable, if Science were complete, to chemical forces supplied to the brain by the blood, and ultimately derived from the food I eat and the air I breathe.
You are well aware that chemical preparations exist, and have existed time out of mind, by means of which it is possible to write upon either paper or vellum, so that the characters shall become visible only when subjected to the action of fire.
In the latter part of the last century there lived a man of science, an eminent proficient in every branch of natural philosophy, who not long before our story opens had made experience of a spiritual affinity more attractive than any chemical one.
None of these was like it, though it had something of them all, with, added, the sourness of chemical waste and the poisonous effluvium of the bilge of a water-logged ship whereon a multitude of rats had been drowned.
A formidable array of bottles and test-tubes, with the pungent cleanly smell of hydrochloric acid, told me that he had spent his day in the chemical work which was so dear to him.
Holmes was seated at his side-table clad in his dressing-gown, and working hard over a chemical investigation.
But he was neither an anarchist nor an antipatriot; his views on disarmament were moderate and evolutionary-- the Republican Government put considerable confidence in him as to various chemical improvements.
His host and his host's household, his men and his maids, as they became intimately known to Clare, began to differentiate themselves as in a chemical process.
That our principal movements were known to the First Born I could not have doubted, in view of the attack of the fleet upon us the day before, nor could the stopping of the pumps of Omean at the psychological moment have been due to chance, nor the starting of a chemical combustion within the one corridor through which we were advancing upon the Temple of Issus been due to aught than well-calculated design.
Fancy a surgeon, with his nippers lifting tendons, muscles and such things into view, out of the complex machinery of a corpse, and observing, "Now this little nerve quivers--the vibration is imparted to this muscle--from here it is passed to this fibrous substance; here its ingredients are separated by the chemical action of the blood--one part goes to the heart and thrills it with what is popularly termed emotion, another part follows this nerve to the brain and communicates intelligence of a startling character--the third part glides along this passage and touches the spring connected with the fluid receptacles that lie in the rear of the eye.
Man lives by pulses; our organic movements are such; and the chemical and ethereal agents are undulatory and alternate; and the mind goes antagonizing on, and never prospers but by fits.