What does "chemistry" mean?

Additional senses

1. 2.A treatise on chemistry. Note: This word and its derivatives were formerly written with y, and sometimes with i, instead of e, in the first syllable, chymistry, chymist, chymical, etc., or chimistry, chimist, chimical, etc.; and the pronunciation was conformed to the orthography. Inorganic chemistry, that which treats of inorganic or mineral substances. -- Organic chemistry, that which treats of the substances which from the structure of organized beings and their products, whether animal or vegetable; -- called also chemistry of the carbon compounds. There is no fundamental difference between organic and inorganic chemistry. -- Physiological chemistry, the chemistry of the organs and tissues of the body, and of the various physiological processes incident to life. -- Practical chemistry, or Applied chemistry, that which treats of the modes of manufacturing the products of chemistry that are useful in the arts, of their applications to economical purposes, and of the conditions essential to their best use. -- Pure chemistry, the consideration of the facts and theories of chemistry in their purely scientific relations, without necessary reference to their practical applications or mere utility.