chemistry

1. (uncountable) The branch of natural science that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules.uncountable

2. (countable) An application of chemical theory and method to a particular substance.Examples: "Learning the very complicated chemistries necessary to reproduce reality into a picture using light"; "The aquatic chemistries of iron and manganese are similar; this “is reflected geologically in their common association in rocks of all kinds” (Bortleson and Lee, 1974)."countable

3. (informal) The mutual attraction between two people; rapport.Examples: "The on-screen chemistry between the lead actors led many viewers to believe they were a couple in real life."; "The coach attributed their losses to poor team chemistry."; "He and [Dennis] Schröder developing pick-and-roll chemistry will certainly be an objective. [Markieff] Morris has a tendency to linger around the mid-range area after setting ball screens, but when he’s popping beyond the 3-point line, he can hurt defenses."countableinformaluncountable

4. (medicine, countable, informal, sometimes proscribed) A blood test to measure the amount of various components of the serum (such as electrolytes, creatinine, and glucose).Examples: "Diagnosis is presumptive by history and physical examination and is confirmed by chemistries."countableinformalproscribedsometimes