Definition of "precursors" [precursors]

• Plural form of precursor. (noun)

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• "Remember when reducing emissions of acid rain precursors was going to cost so much that a lucrative emissions credit market was going to spring up? joe from Lowell Says:"
• "Polyps are abnormal tissue growths of the mucus membrane that are frequently identified as precursors of cancer."
• "Foreshocks are basically earthquakes and are identified as precursors only after another quake follows."