PRECURSOR By N., Pam M.S. - April 7, 2013 noun. With regard to biochemistry, a compound from which another is cultivated by a chemical response. PRECURSOR: "The precursor was obvious once they stated that the compound was H2O." Related Psychology Terms OXIDATION MODULATORY SITE THYMINE PENETRANCE BIOTRANSFORMATION TRUE SELF RADIOACTIVE TRACER TIE-IN PLURALISM WHITTEN EFFECT Cite this page: N., Pam M.S., "PRECURSOR," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/precursor/ (accessed June 4, 2020).