precursor
/pɹɪˈkɜɹ.səɹ/ noun C1- 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.
Plural precursors
From the library
Again I saw that grim face look over the cliff, and I knew that it was the precursor of another stone.
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