Meanings (ES + gloss)
precursor
That which precurses: a forerunner, predecessor, or indicator of approaching events.
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis:[…]. The evolutionary precursor of photosynthesis is still under debate, and a n…
precursor
One of the compounds that participates in the chemical reaction that produces another compound.
Phrases
Word forms