precursor

One that precedes and indicates, suggests, or announces someone or something to come.

One that precedes another; a forerunner or predecessor.

A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, from which a more stable or definitive product is formed.

A forerunner; also, that which precedes an event and indicates its approach.

Synonyms Predecessor, herald, omen, sign.

Specifically, in the history of the fine arts, an early artist of a school or period, or an artist who preceded such a school or period. The precursors of the Renaissance in Italy are the sculptors and painters of the thirteenth and fourteenth centuries. such as Niccola Pisano, Giotto, etc.

One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger.

That which precurses, a forerunner, a predecessor, an indicator of approaching events.

One of the compounds that participates in the chemical reaction that produces another compound.

something that precedes and indicates the approach of something or someone