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precursor noun

  /pɹəˈkøː.sɐ/ , /pɹɪˈkɜɹ.səɹ/ , /pɹɪˈkɜː.sə/ , /pɹɪˈkʌɹ.səɹ/ , /pɾɪˈkəːʳ.səʳ/ , /ˈpɹiˌkɜɹ.səɹ/ , /ˈpɹiˌkʌɹ.səɹ/ , /ˈpɹiːˌkøː.sɐ/ , /ˈpɹiːˌkɜː.sə/ , /ˈpɾiːˌkəːʳ.səʳ/
  • (chemistry) One of the compounds that participates in the chemical reaction that produces another compound.
 precursore
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