fluorimetry

This term refers to a specialized analytical technique used primarily in chemistry and biochemistry. It is a technical term of art, meaning it is almost exclusively found in scientific literature, laboratory manuals, and academic papers rather than in general conversation.

As a field of study or a specific measurement process, the word is uncountable. It describes the methodology itself rather than a discrete object. One does not perform "a fluorimetry," but rather "performs fluorimetry" or "uses fluorimetry" to achieve a result.