Etymology of chemistry

The word "chemistry" derives from the word "alchemy", which is found in various forms in European languages. "Alchemy" derives from the Arabic word "kimiya" () or "al-kīmiyāʾ" (). The Arabic term is derived from the Ancient Greek , "khēmia", or , "khēmeia", 'art of alloying metals', from χύμα (khúma, “fluid”), from χέω (khéō, “I pour”). 
However, the ultimate origin of the word is uncertain.
According to the "Oxford English Dictionary", "al-kīmiyāʾ" may be derived from the greek , which is derived from the ancient Egyptian name of Egypt, "khem" or "khm", "khame", or "khmi", meaning "blackness", i.e., the rich dark soil of the Nile river valley. Therefore, alchemy can be seen as the "Egyptian art" or the "black art". However, it is also possible that "al-kīmiyāʾ" derived from , meaning "cast together".
Overview.
There are two main views on the derivation of the Greek word. According to one, the word comes from the greek "χημεία", pouring, infusion, used in connexion with the study of the juices of plants, and thence extended to chemical manipulations in general; this derivation accounts for the old-fashioned spellings "chymist" and "chymistry". The other view traces it to "khem" or "khame", hieroglyph "khmi", which denotes black earth as opposed to barren sand, and occurs in Plutarch as "χημεία"; on this derivation alchemy is explained as meaning the "Egyptian art". The first occurrence of the word is said to be in a treatise of Julius Firmicus, an astrological writer of the 4th century, but the prefix al there must be the addition of a later Arabic copyist. In English, Piers Plowman (1362) contains the phrase "experimentis of alconomye", with variants "alkenemye" and " alknamye". The prefix "al" began to be dropped about the middle of the 16th century (further details of which are given below).
Egyptian origin.
According to the Egyptologist Wallis Budge, the Arabic word "al-kīmiyaʾ" actually means "the Egyptian [science]", borrowing from the Coptic word for "Egypt", "kēme" (or its equivalent in the Mediaeval Bohairic dialect of Coptic, "khēme"). This Coptic word derives from Demotic "kmỉ", itself from ancient Egyptian "kmt". The ancient Egyptian word referred to both the country and the colour "black" (Egypt was the "Black Land", by contrast with the "Red Land", the surrounding desert); so this etymology could also explain the nickname "Egyptian black arts". However, according to Mahn, this theory may be an example of folk etymology. Assuming an Egyptian origin, chemistry is defined as follows:
Thus, according to Budge and others, chemistry derives from an Egyptian word "khemein" or "khēmia", "preparation of black powder", ultimately derived from the name "khem", Egypt. A decree of Diocletian, written about 300 AD in Greek, speaks against "the ancient writings of the Egyptians, which treat of the "khēmia" transmutation of gold and silver".
Greek origin.
Arabic "al-kīmiyaʾ" or "al-khīmiyaʾ" ( or ), according to some, is thought to derive from the Koine Greek word "khymeia" () meaning "the art of alloying metals, alchemy"; in the manuscripts, this word is also written "khēmeia" () or "kheimeia" (), which is the probable basis of the Arabic form. According to Mahn, the Greek word χυμεία "khumeia" originally meant "pouring together", "casting together", "weld", "alloy", etc. (cf. Gk. "kheein" () "to pour"; "khuma" (), "that which is poured out, an ingot"). Assuming a Greek origin, chemistry is defined as follows:
From alchemy to chemistry.
Later medieval Latin had "alchimia / alchymia" "alchemy", "alchimicus" "alchemical", and "alchimista" "alchemist". The mineralogist and humanist Georg Agricola (died 1555) was the first to drop the Arabic definite article "al-". In his Latin works from 1530 on he exclusively wrote "chymia" and "chymista" in describing activity that we today would characterize as chemical or alchemical. As a humanist, Agricola was intent on purifying words and returning them to their classical roots. He had no intent to make a semantic distinction between "chymia" and "alchymia".
During the later sixteenth century Agricola's new coinage slowly propagated. It seems to have been adopted in most of the vernacular European languages following Conrad Gessner's adoption of it in his extremely popular pseudonymous work, "Thesaurus Euonymi Philiatri De remediis secretis: Liber physicus, medicus, et partim etiam chymicus" (Zurich 1552). Gessner's work was frequently re-published in the second half of the 16th century in Latin and was also published in a number of vernacular European languages, with the word spelled without the "al-".
In the 16th and 17th centuries in Europe the forms "alchimia" and "chimia" (and "chymia") were synonymous and interchangeable. The semantic distinction between a rational and practical science of "chimia" and an occult "alchimia" arose only in the early eighteenth century.
In 16th, 17th and early 18th century English the spellings — both with and without the "al" — were usually with an "i" or "y" as in "chimic / chymic / alchimic / alchymic". During the later 18th century the spelling was re-fashioned to use a letter "e", as in "chemic" in English. In English after the spelling shifted from "chimical" to "chemical", there was corresponding shift from "alchimical" to "alchemical", which occurred in the early 19th century. In French, Italian, Spanish and Russian today it continues to be spelled with an i as in for example Italian "chimica".