The phrase "precursor materials" refers to substances or components that are used to create or produce something else. They are like the ingredients or building blocks that are needed before making a final product. Full definition
Or, one material could be used as a template to be coated by another material with the simple substitution of precursor materials. (sciencedaily.com)
They produce the materials by heating a readily available precursor material, which also allows them to incorporate triply charged europium ions, Eu3 +, as «dopants» into any of the LaOBr nanocrystals. (sciencedaily.com)
This means that you will start to see substantial drops in hormones like DHEA and testosterone, as hormone precursor material is diverted towards the cortisol production pathway. (adrenalfatiguesolution.com)