Reactant vs. Educt — What's the Difference?

A substance that is altered or incorporated into another substance in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction.

That which is educed.

(chemistry) Any of the participants present at the start of a chemical reaction, specifically one that is consumed during the reaction.

A reactant.

A chemical substance that is present at the start of a chemical reaction

(engineering) To educe, to extract.

That which is educed, as by analysis.