Chemistry

Noun

1. 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.
2. An application of chemical theory and method to a particular substance.
3. The chemical properties and reactions of a particular organism, environment etc.
4. The mutual attraction between two people; rapport.

   "The on-screen chemistry between the lead actors led many viewers to believe they were a couple in real life."

5. A blood test to measure the amount of various components of the serum (such as electrolytes, creatinine, and glucose).

   "Diagnosis is presumptive by history and physical examination and is confirmed by chemistries."