Reactant

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Any of the participants present at the start of a chemical reaction, specifically one that is consumed during the reaction.
  2. 2
    a chemical substance that is present at the start of a chemical reaction wordnet

Example

More examples

"A displacement reaction is a chemical reaction in which the cation or anion of one reactant is replaced by one from another reactant."

Etymology

From react + -ant.

Related phrases

chemical reaction

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.