Histochemistry refers to the branch of histology that focuses on the chemistry of living tissues and cells. There are various synonyms that can be used to describe the field of histochemistry, including cytochemistry, cellular biochemistry, and tissue chemistry. Cytochemistry emphasizes the study of the chemistry of cellular constituents, while cellular biochemistry emphasizes the study of the chemical processes that take place within cells. Tissue chemistry, on the other hand, focuses on the chemical processes that take place within tissues. Overall, the different synonyms for histochemistry all highlight the importance of studying the chemical composition and functions of living tissues and cells.