metabolomics

This term refers to a specialized field of scientific study rather than a physical object or a countable process. It describes the comprehensive analysis of the metabolome, focusing on the chemical fingerprints that specific cellular processes leave behind.

As a field of study ending in -omics, it is an uncountable noun. It functions similarly to words like genetics or economics, where the term describes a whole discipline of research and cannot be pluralized to describe multiple instances of the study.