precursor UK /pɹɪˈkɜː.sə/US /pɹɪˈkɜɹ.səɹ/noun 2adjective 1forms 1 noun2 •That which precurses: a forerunner, predecessor, or indicator of approaching events. •One of the compounds that participates in the chemical reaction that produces another compound. adjective1 •Caused by the following symbol. formsprecursors
