alchemy

1. (uncountable) The premodern and early modern study of physical changes, particularly in Europe, Arabia, and China; and chiefly in pursuit of an elixir of immortality, a universal panacea, and/or a philosopher's stone able to transmute base metals into gold, eventually developing into chemistry.Examples: "And yet surely to alchemy this right is due, that it may be compared to the husbandman whereof Æsop makes the fable; that, when he died, told his sons that he had left unto them gold buried underground in his vineyard; and they digged over all the ground, and gold they found none; but by reason of their stirring and digging the mould about the roots of their vines, they had a great vintage the year following: so assuredly the search and stir to make gold hath brought to light a great number of good and fruitful inventions and experiments, as well for the disclosing of nature as for the use of man’s life."; "The [Isaac] Newton that emerges from the [unpublished] manuscripts is far from the popular image of a rational practitioner of cold and pure reason. The architect of modern science was himself not very modern. He was obsessed with alchemy."; "The purpose of physical alchemy—as opposed to its various spiritual pursuits—was to treat the supposed leprosity of base metals such as lead, refining and purifying them into gold."uncountable

2. (countable) The causing of any sort of mysterious sudden transmutation.Examples: "O, he sits high in all the people’s hearts: And that which would appear offence in us, His countenance, like richest alchemy, Will change to virtue and to worthiness."; "1640, George Herbert, Jacula Prudentum; or, Outlandish Proverbs, Sentences, etc., in The Remains of that Sweet Singer of the Temple George Herbert, London: Pickering, 1841, p. 143, No alchymy to saving."; "Then of their session ended they bid cry With trumpet’s regal sound the great result: Toward the four winds four speedy Cherubim Put to their mouths the sounding alchemy, By herald’s voice explained; the hollow Abyss Heard far and wide, and all the host of Hell With deafening shout returned them loud acclaim."countable

3. (computing, slang, countable) Any elaborate transformation process or algorithm.countableslang