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precipitant
precipitate
precipitation
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precipitinogen
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precursor

pre·cur·sor [ prə kúrssər, pr kùrssər ] (plural pre·cur·sors)


noun 
Definition:
 
1. somebody or something that comes earlier: somebody or something that comes before, and is often considered to lead to the development of, another person or thing

2. previous holder of job: somebody who held a position or job before somebody else

3. chemistry chemical compound preceding another: a chemical compound that leads to another, usually more stable, product in a series of connected reactions

[Early 16th century. < Latin praecursor< praecurs-, stem of praecurrere "run before" < currere "run"]
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